91998322560 has 192 divisors, whose sum is σ = 329448253680. Its totient is φ = 24532844544.

The previous prime is 91998322519. The next prime is 91998322573. The reversal of 91998322560 is 6522389919.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a junction number, because it is equal to n+sod(n) for n = 91998322497 and 91998322506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140257 + ... + 451296.

Almost surely, 2^91998322560 is an apocalyptic number.

91998322560 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91998322560 is an abundant number, since it is smaller than the sum of its proper divisors (237449931120).

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

91998322560 is an equidigital number, since it uses as much as digits as its factorization.

91998322560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591587 (or 591563 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 91998322560 in words is "ninety-one billion, nine hundred ninety-eight million, three hundred twenty-two thousand, five hundred sixty".