91661764453 has 8 divisors (see below), whose sum is σ = 105194615040. Its totient is φ = 78238492080.

The previous prime is 91661764451. The next prime is 91661764477. The reversal of 91661764453 is 35446716619.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91661764453 - 2¹ = 91661764451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91661764453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91661764451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27392758 + ... + 27396103.

It is an arithmetic number, because the mean of its divisors is an integer number (13149326880).

Almost surely, 2^91661764453 is an apocalyptic number.

It is an amenable number.

91661764453 is a deficient number, since it is larger than the sum of its proper divisors (13532850587).

91661764453 is a wasteful number, since it uses less digits than its factorization.

91661764453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54789107.

The product of its digits is 3265920, while the sum is 52.

The spelling of 91661764453 in words is "ninety-one billion, six hundred sixty-one million, seven hundred sixty-four thousand, four hundred fifty-three".