918693422640 has 640 divisors, whose sum is σ = 3752974080000. Its totient is φ = 206418143232.

The previous prime is 918693422627. The next prime is 918693422663. The reversal of 918693422640 is 46224396819.

918693422640 is a `hidden beast` number, since 91 + 8 + 6 + 93 + 422 + 6 + 40 = 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43701412 + ... + 43722428.

It is an arithmetic number, because the mean of its divisors is an integer number (5864022000).

Almost surely, 2^918693422640 is an apocalyptic number.

918693422640 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 918693422640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1876487040000).

918693422640 is an abundant number, since it is smaller than the sum of its proper divisors (2834280657360).

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

918693422640 is a wasteful number, since it uses less digits than its factorization.

918693422640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21119 (or 21093 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 918693422640 in words is "nine hundred eighteen billion, six hundred ninety-three million, four hundred twenty-two thousand, six hundred forty".