915901136640 has 504 divisors, whose sum is σ = 3759226181088. Its totient is φ = 209347338240.

The previous prime is 915901136629. The next prime is 915901136651. The reversal of 915901136640 is 46631109519.

915901136640 is a `hidden beast` number, since 9 + 1 + 590 + 1 + 13 + 6 + 6 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (915901136629) and next prime (915901136651).

It is a tau number, because it is divible by the number of its divisors (504).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 6461730 + ... + 6601950.

Almost surely, 2^915901136640 is an apocalyptic number.

915901136640 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 915901136640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1879613090544).

915901136640 is an abundant number, since it is smaller than the sum of its proper divisors (2843325044448).

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

915901136640 is an equidigital number, since it uses as much as digits as its factorization.

915901136640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140267 (or 140238 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 915901136640 in words is "nine hundred fifteen billion, nine hundred one million, one hundred thirty-six thousand, six hundred forty".