691490697120 has 768 divisors, whose sum is σ = 2717071257600. Its totient is φ = 163393044480.

The previous prime is 691490697097. The next prime is 691490697133. The reversal of 691490697120 is 21796094196.

It is a happy number.

691490697120 is a `hidden beast` number, since 6 + 9 + 1 + 490 + 69 + 71 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 84231576 + ... + 84239784.

It is an arithmetic number, because the mean of its divisors is an integer number (3537853200).

Almost surely, 2^691490697120 is an apocalyptic number.

691490697120 is a gapful number since it is divisible by the number (60) 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 691490697120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1358535628800).

691490697120 is an abundant number, since it is smaller than the sum of its proper divisors (2025580560480).

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

691490697120 is a wasteful number, since it uses less digits than its factorization.

691490697120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318 (or 8304 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 691490697120 in words is "six hundred ninety-one billion, four hundred ninety million, six hundred ninety-seven thousand, one hundred twenty".