91164755578 has 16 divisors (see below), whose sum is σ = 147328354656. Its totient is φ = 42058266480.

The previous prime is 91164755537. The next prime is 91164755587. The reversal of 91164755578 is 87555746119.

It is a super-3 number, since 3×91164755578³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677776 + ... + 801067.

It is an arithmetic number, because the mean of its divisors is an integer number (9208022166).

Almost surely, 2^91164755578 is an apocalyptic number.

91164755578 is a deficient number, since it is larger than the sum of its proper divisors (56163599078).

91164755578 is a wasteful number, since it uses less digits than its factorization.

91164755578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481229.

The product of its digits is 10584000, while the sum is 58.

The spelling of 91164755578 in words is "ninety-one billion, one hundred sixty-four million, seven hundred fifty-five thousand, five hundred seventy-eight".