691107746072 has 8 divisors (see below), whose sum is σ = 1295827023900. Its totient is φ = 345553873032.

The previous prime is 691107746071. The next prime is 691107746083. The reversal of 691107746072 is 270647701196.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 691107746072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691107746071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43194234122 + ... + 43194234137.

Almost surely, 2^691107746072 is an apocalyptic number.

It is an amenable number.

691107746072 is a deficient number, since it is larger than the sum of its proper divisors (604719277828).

691107746072 is a wasteful number, since it uses less digits than its factorization.

691107746072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86388468265 (or 86388468261 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 50.

The spelling of 691107746072 in words is "six hundred ninety-one billion, one hundred seven million, seven hundred forty-six thousand, seventy-two".