691020020196 has 72 divisors (see below), whose sum is σ = 1928498461344. Its totient is φ = 206877104640.

The previous prime is 691020020191. The next prime is 691020020209.

691020020196 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 691020020196.

It is not an unprimeable number, because it can be changed into a prime (691020020191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10479181 + ... + 10544916.

It is an arithmetic number, because the mean of its divisors is an integer number (26784700852).

Almost surely, 2^691020020196 is an apocalyptic number.

691020020196 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

691020020196 is an abundant number, since it is smaller than the sum of its proper divisors (1237478441148).

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

691020020196 is a wasteful number, since it uses less digits than its factorization.

691020020196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21024201 (or 21024196 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

It can be divided in two parts, 6910200 and 20196, that added together give a palindrome (6930396).

The spelling of 691020020196 in words is "six hundred ninety-one billion, twenty million, twenty thousand, one hundred ninety-six".