691865012448 has 72 divisors (see below), whose sum is σ = 2030958611136. Its totient is φ = 223182259200.

The previous prime is 691865012407. The next prime is 691865012459. The reversal of 691865012448 is 844210568196.

691865012448 is a `hidden beast` number, since 6 + 9 + 186 + 5 + 0 + 12 + 448 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 691865012394 and 691865012403.

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, 38737993 + ... + 38755848.

It is an arithmetic number, because the mean of its divisors is an integer number (28207758488).

Almost surely, 2^691865012448 is an apocalyptic number.

It is an amenable number.

691865012448 is an abundant number, since it is smaller than the sum of its proper divisors (1339093598688).

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

691865012448 is a wasteful number, since it uses less digits than its factorization.

691865012448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77493888 (or 77493877 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 691865012448 in words is "six hundred ninety-one billion, eight hundred sixty-five million, twelve thousand, four hundred forty-eight".