51949006920 has 192 divisors, whose sum is σ = 173085232320. Its totient is φ = 13505490432.

The previous prime is 51949006919. The next prime is 51949006931. The reversal of 51949006920 is 2960094915.

51949006920 is a `hidden beast` number, since 519 + 49 + 0 + 0 + 6 + 92 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9083902 + ... + 9089618.

It is an arithmetic number, because the mean of its divisors is an integer number (901485585).

Almost surely, 2^51949006920 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 51949006920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86542616160).

51949006920 is an abundant number, since it is smaller than the sum of its proper divisors (121136225400).

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

51949006920 is a wasteful number, since it uses less digits than its factorization.

51949006920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364 (or 6357 counting only the distinct ones).

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

The spelling of 51949006920 in words is "fifty-one billion, nine hundred forty-nine million, six thousand, nine hundred twenty".