91657297848 has 32 divisors (see below), whose sum is σ = 229301688960. Its totient is φ = 30531306720.

The previous prime is 91657297841. The next prime is 91657297859. The reversal of 91657297848 is 84879275619.

It is a super-2 number, since 2×91657297848² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91657297841) 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, 1284918 + ... + 1354373.

It is an arithmetic number, because the mean of its divisors is an integer number (7165677780).

Almost surely, 2^91657297848 is an apocalyptic number.

It is an amenable number.

91657297848 is an abundant number, since it is smaller than the sum of its proper divisors (137644391112).

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

91657297848 is a wasteful number, since it uses less digits than its factorization.

91657297848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640747 (or 2640743 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 66.

The spelling of 91657297848 in words is "ninety-one billion, six hundred fifty-seven million, two hundred ninety-seven thousand, eight hundred forty-eight".