11691977652 has 72 divisors (see below), whose sum is σ = 30379055616. Its totient is φ = 3788800704.

The previous prime is 11691977597. The next prime is 11691977653. The reversal of 11691977652 is 25677919611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11691977653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1977733 + ... + 1983635.

It is an arithmetic number, because the mean of its divisors is an integer number (421931328).

Almost surely, 2^11691977652 is an apocalyptic number.

11691977652 is a gapful number since it is divisible by the number (12) 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 11691977652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15189527808).

11691977652 is an abundant number, since it is smaller than the sum of its proper divisors (18687077964).

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

11691977652 is a wasteful number, since it uses less digits than its factorization.

11691977652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7437 (or 7432 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 54.

The spelling of 11691977652 in words is "eleven billion, six hundred ninety-one million, nine hundred seventy-seven thousand, six hundred fifty-two".