91916841572 has 6 divisors (see below), whose sum is σ = 160854472758. Its totient is φ = 45958420784.

The previous prime is 91916841563. The next prime is 91916841593. The reversal of 91916841572 is 27514861919.

It can be written as a sum of positive squares in only one way, i.e., 53409058816 + 38507782756 = 231104^2 + 196234^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11489605193 + ... + 11489605200.

It is an arithmetic number, because the mean of its divisors is an integer number (26809078793).

Almost surely, 2^91916841572 is an apocalyptic number.

It is an amenable number.

91916841572 is a deficient number, since it is larger than the sum of its proper divisors (68937631186).

91916841572 is a wasteful number, since it uses less digits than its factorization.

91916841572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22979210397 (or 22979210395 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 53.

The spelling of 91916841572 in words is "ninety-one billion, nine hundred sixteen million, eight hundred forty-one thousand, five hundred seventy-two".