91657723746 has 16 divisors (see below), whose sum is σ = 189228849408. Its totient is φ = 29567007600.

The previous prime is 91657723741. The next prime is 91657723763. The reversal of 91657723746 is 64732775619.

It is a super-2 number, since 2×91657723746² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91657723741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246391545 + ... + 246391916.

It is an arithmetic number, because the mean of its divisors is an integer number (11826803088).

Almost surely, 2^91657723746 is an apocalyptic number.

91657723746 is an abundant number, since it is smaller than the sum of its proper divisors (97571125662).

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

91657723746 is a wasteful number, since it uses less digits than its factorization.

91657723746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492783497.

The product of its digits is 13335840, while the sum is 57.

The spelling of 91657723746 in words is "ninety-one billion, six hundred fifty-seven million, seven hundred twenty-three thousand, seven hundred forty-six".