91637072751 has 16 divisors (see below), whose sum is σ = 146986784000. Its totient is φ = 49608039168.

The previous prime is 91637072749. The next prime is 91637072767. The reversal of 91637072751 is 15727073619.

It is not a de Polignac number, because 91637072751 - 2¹ = 91637072749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91637072751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91637072251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114833026 + ... + 114833823.

It is an arithmetic number, because the mean of its divisors is an integer number (9186674000).

Almost surely, 2^91637072751 is an apocalyptic number.

91637072751 is a deficient number, since it is larger than the sum of its proper divisors (55349711249).

91637072751 is a wasteful number, since it uses less digits than its factorization.

91637072751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229666878.

The product of its (nonzero) digits is 555660, while the sum is 48.

It can be divided in two parts, 916370 and 72751, that added together give a triangular number (989121 = T₁₄₀₆).

The spelling of 91637072751 in words is "ninety-one billion, six hundred thirty-seven million, seventy-two thousand, seven hundred fifty-one".