91023071564 has 6 divisors (see below), whose sum is σ = 159290375244. Its totient is φ = 45511535780.

The previous prime is 91023071521. The next prime is 91023071609. The reversal of 91023071564 is 46517032019.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377883942 + ... + 11377883949.

It is an arithmetic number, because the mean of its divisors is an integer number (26548395874).

Almost surely, 2^91023071564 is an apocalyptic number.

It is an amenable number.

91023071564 is a deficient number, since it is larger than the sum of its proper divisors (68267303680).

91023071564 is a wasteful number, since it uses less digits than its factorization.

91023071564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22755767895 (or 22755767893 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 91023071564 in words is "ninety-one billion, twenty-three million, seventy-one thousand, five hundred sixty-four".