51000995556 has 243 divisors, whose sum is σ = 158836900131. Its totient is φ = 13756000608.

The previous prime is 51000995533. The next prime is 51000995557. The reversal of 51000995556 is 65559900015.

The square root of 51000995556 is 225834.

It is a perfect power (a square), and thus also a powerful number.

51000995556 is a `hidden beast` number, since 5 + 1 + 0 + 0 + 0 + 9 + 95 + 556 = 666.

It is a super-2 number, since 2×51000995556² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51000995557) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 180215391 + ... + 180215673.

Almost surely, 2^51000995556 is an apocalyptic number.

51000995556 is the 225834-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51000995556

51000995556 is an abundant number, since it is smaller than the sum of its proper divisors (107835904575).

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

51000995556 is a wasteful number, since it uses less digits than its factorization.

51000995556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 303750, while the sum is 45.

The spelling of 51000995556 in words is "fifty-one billion, nine hundred ninety-five thousand, five hundred fifty-six".