51213907008 has 336 divisors, whose sum is σ = 162779512896. Its totient is φ = 15266119680.

The previous prime is 51213907001. The next prime is 51213907037. The reversal of 51213907008 is 80070931215.

51213907008 is a `hidden beast` number, since 512 + 139 + 0 + 7 + 0 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51213907001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166820391 + ... + 166820697.

It is an arithmetic number, because the mean of its divisors is an integer number (484462836).

Almost surely, 2^51213907008 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 51213907008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81389756448).

51213907008 is an abundant number, since it is smaller than the sum of its proper divisors (111565605888).

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

51213907008 is a wasteful number, since it uses less digits than its factorization.

51213907008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 51213907008 in words is "fifty-one billion, two hundred thirteen million, nine hundred seven thousand, eight".