691116077372 has 144 divisors (see below), whose sum is σ = 1540145859840. Its totient is φ = 264920544000.

The previous prime is 691116077371. The next prime is 691116077423. The reversal of 691116077372 is 273770611196.

691116077372 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 691116077372.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691116077371) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20944847 + ... + 20977817.

It is an arithmetic number, because the mean of its divisors is an integer number (10695457360).

Almost surely, 2^691116077372 is an apocalyptic number.

691116077372 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691116077372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770072929920).

691116077372 is an abundant number, since it is smaller than the sum of its proper divisors (849029782468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691116077372 is a wasteful number, since it uses less digits than its factorization.

691116077372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33104 (or 33071 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 50.

The spelling of 691116077372 in words is "six hundred ninety-one billion, one hundred sixteen million, seventy-seven thousand, three hundred seventy-two".