50957991000 has 960 divisors, whose sum is σ = 213421871520. Its totient is φ = 11300083200.

The previous prime is 50957990969. The next prime is 50957991151. The reversal of 50957991000 is 19975905.

50957991000 is a `hidden beast` number, since 509 + 57 + 9 + 91 + 0 + 0 + 0 = 666.

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 239 ways as a sum of consecutive naturals, for example, 146852827 + ... + 146853173.

Almost surely, 2^50957991000 is an apocalyptic number.

50957991000 is a gapful number since it is divisible by the number (50) 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 50957991000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106710935760).

50957991000 is an abundant number, since it is smaller than the sum of its proper divisors (162463880520).

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

50957991000 is a wasteful number, since it uses less digits than its factorization.

50957991000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 127575, while the sum is 45.

The spelling of 50957991000 in words is "fifty billion, nine hundred fifty-seven million, nine hundred ninety-one thousand".