91750366561 has 16 divisors (see below), whose sum is σ = 105238014336. Its totient is φ = 78358070016.

The previous prime is 91750366553. The next prime is 91750366637. The reversal of 91750366561 is 16566305719.

It is a cyclic number.

It is not a de Polignac number, because 91750366561 - 2³ = 91750366553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91750366531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5354770 + ... + 5371876.

It is an arithmetic number, because the mean of its divisors is an integer number (6577375896).

Almost surely, 2^91750366561 is an apocalyptic number.

It is an amenable number.

91750366561 is a deficient number, since it is larger than the sum of its proper divisors (13487647775).

91750366561 is a wasteful number, since it uses less digits than its factorization.

91750366561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19848.

The product of its (nonzero) digits is 1020600, while the sum is 49.

It can be divided in two parts, 917503 and 66561, that added together give a square (984064 = 992²).

The spelling of 91750366561 in words is "ninety-one billion, seven hundred fifty million, three hundred sixty-six thousand, five hundred sixty-one".