91554664068 has 144 divisors (see below), whose sum is σ = 276446096640. Its totient is φ = 26127323712.

The previous prime is 91554664043. The next prime is 91554664147. The reversal of 91554664068 is 86046645519.

91554664068 is a `hidden beast` number, since 91 + 5 + 546 + 6 + 4 + 0 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4631221 + ... + 4650947.

It is an arithmetic number, because the mean of its divisors is an integer number (1919764560).

Almost surely, 2^91554664068 is an apocalyptic number.

91554664068 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91554664068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138223048320).

91554664068 is an abundant number, since it is smaller than the sum of its proper divisors (184891432572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91554664068 is a wasteful number, since it uses less digits than its factorization.

91554664068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20631 (or 20616 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 91554664068 in words is "ninety-one billion, five hundred fifty-four million, six hundred sixty-four thousand, sixty-eight".