50981570640 has 2560 divisors, whose sum is σ = 266382950400. Its totient is φ = 8599633920.

The previous prime is 50981570617. The next prime is 50981570669. The reversal of 50981570640 is 4607518905.

50981570640 is a `hidden beast` number, since 509 + 8 + 15 + 70 + 64 + 0 = 666.

50981570640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 698377644 + ... + 698377716.

It is an arithmetic number, because the mean of its divisors is an integer number (104055840).

Almost surely, 2^50981570640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50981570640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133191475200).

50981570640 is an abundant number, since it is smaller than the sum of its proper divisors (215401379760).

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

50981570640 is a wasteful number, since it uses less digits than its factorization.

50981570640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 50981570640 in words is "fifty billion, nine hundred eighty-one million, five hundred seventy thousand, six hundred forty".