51000001506 has 12 divisors (see below), whose sum is σ = 110500003302. Its totient is φ = 17000000496.

The previous prime is 51000001501. The next prime is 51000001517. The reversal of 51000001506 is 60510000015.

51000001506 is a `hidden beast` number, since 510 + 0 + 0 + 0 + 0 + 150 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31485308481 + 19514693025 = 177441^2 + 139695^2 .

It is a super-2 number, since 2×51000001506² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2833333417 = 51000001506 / (5 + 1 + 0 + 0 + 0 + 0 + 0 + 1 + 5 + 0 + 6).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51000001501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1416666691 + ... + 1416666726.

Almost surely, 2^51000001506 is an apocalyptic number.

51000001506 is an abundant number, since it is smaller than the sum of its proper divisors (59500001796).

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

51000001506 is a wasteful number, since it uses less digits than its factorization.

51000001506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833333425 (or 2833333422 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The spelling of 51000001506 in words is "fifty-one billion, one thousand, five hundred six".