51216953208 has 16 divisors (see below), whose sum is σ = 128042383080. Its totient is φ = 17072317728.

The previous prime is 51216953191. The next prime is 51216953213. The reversal of 51216953208 is 80235961215.

It is a super-2 number, since 2×51216953208² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51216953208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067019835 + ... + 1067019882.

Almost surely, 2^51216953208 is an apocalyptic number.

It is an amenable number.

51216953208 is an abundant number, since it is smaller than the sum of its proper divisors (76825429872).

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

51216953208 is a wasteful number, since it uses less digits than its factorization.

51216953208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134039726 (or 2134039722 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 51216953208 in words is "fifty-one billion, two hundred sixteen million, nine hundred fifty-three thousand, two hundred eight".