91000454661 has 48 divisors (see below), whose sum is σ = 138151802880. Its totient is φ = 57610967040.

The previous prime is 91000454659. The next prime is 91000454711. The reversal of 91000454661 is 16645400019.

91000454661 is a `hidden beast` number, since 9 + 100 + 0 + 4 + 546 + 6 + 1 = 666.

It is not a de Polignac number, because 91000454661 - 2¹ = 91000454659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000454641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22810855 + ... + 22814843.

It is an arithmetic number, because the mean of its divisors is an integer number (2878162560).

Almost surely, 2^91000454661 is an apocalyptic number.

It is an amenable number.

91000454661 is a deficient number, since it is larger than the sum of its proper divisors (47151348219).

91000454661 is a wasteful number, since it uses less digits than its factorization.

91000454661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786 (or 4783 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 91000454661 in words is "ninety-one billion, four hundred fifty-four thousand, six hundred sixty-one".