691464157697600 has 504 divisors, whose sum is σ = 2077693563029760. Its totient is φ = 225537274368000.

The previous prime is 691464157697479. The next prime is 691464157697611. The reversal of 691464157697600 is 6796751464196.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 140982530 + ... + 145804670.

Almost surely, 2^{691464157697600} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691464157697600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038846781514880).

691464157697600 is an abundant number, since it is smaller than the sum of its proper divisors (1386229405332160).

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

691464157697600 is a wasteful number, since it uses less digits than its factorization.

691464157697600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4822267 (or 4822245 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 71.

The spelling of 691464157697600 in words is "six hundred ninety-one trillion, four hundred sixty-four billion, one hundred fifty-seven million, six hundred ninety-seven thousand, six hundred".