691487316864 has 96 divisors (see below), whose sum is σ = 2017852752240. Its totient is φ = 227249326080.

The previous prime is 691487316829. The next prime is 691487316887. The reversal of 691487316864 is 468613784196.

It is a happy number.

691487316864 is a `hidden beast` number, since 6 + 9 + 1 + 487 + 31 + 68 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4145317 + ... + 4308900.

Almost surely, 2^691487316864 is an apocalyptic number.

691487316864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

691487316864 is an abundant number, since it is smaller than the sum of its proper divisors (1326365435376).

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

691487316864 is a wasteful number, since it uses less digits than its factorization.

691487316864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8454308 (or 8454293 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 691487316864 in words is "six hundred ninety-one billion, four hundred eighty-seven million, three hundred sixteen thousand, eight hundred sixty-four".