91386155520 has 480 divisors, whose sum is σ = 348432948864. Its totient is φ = 21951283200.

The previous prime is 91386155501. The next prime is 91386155527. The reversal of 91386155520 is 2555168319.

91386155520 is a `hidden beast` number, since 9 + 1 + 3 + 8 + 615 + 5 + 5 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91386155527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28637125 + ... + 28640315.

Almost surely, 2^91386155520 is an apocalyptic number.

91386155520 is a gapful number since it is divisible by the number (90) 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 91386155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174216474432).

91386155520 is an abundant number, since it is smaller than the sum of its proper divisors (257046793344).

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

91386155520 is a wasteful number, since it uses less digits than its factorization.

91386155520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344 (or 3325 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 91386155520 in words is "ninety-one billion, three hundred eighty-six million, one hundred fifty-five thousand, five hundred twenty".