91355488655490 has 128 divisors (see below), whose sum is σ = 255144613478400. Its totient is φ = 23216282907840.

The previous prime is 91355488655489. The next prime is 91355488655537. The reversal of 91355488655490 is 9455688455319.

91355488655490 is a `hidden beast` number, since 9 + 1 + 3 + 5 + 5 + 4 + 8 + 86 + 55 + 490 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25459210 + ... + 28825029.

It is an arithmetic number, because the mean of its divisors is an integer number (1993317292800).

Almost surely, 2^{91355488655490} is an apocalyptic number.

91355488655490 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91355488655490 is an abundant number, since it is smaller than the sum of its proper divisors (163789124822910).

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

91355488655490 is a wasteful number, since it uses less digits than its factorization.

91355488655490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54284549 (or 54284543 counting only the distinct ones).

The product of its (nonzero) digits is 933120000, while the sum is 72.

The spelling of 91355488655490 in words is "ninety-one trillion, three hundred fifty-five billion, four hundred eighty-eight million, six hundred fifty-five thousand, four hundred ninety".