51061306665530 has 24 divisors (see below), whose sum is σ = 106916123753748. Its totient is φ = 17506733713728.

The previous prime is 51061306665527. The next prime is 51061306665541. The reversal of 51061306665530 is 3556660316015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51017291884321 + 44014781209 = 7142639^2 + 209797^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52103373659 + ... + 52103374638.

Almost surely, 2^{51061306665530} is an apocalyptic number.

51061306665530 is an abundant number, since it is smaller than the sum of its proper divisors (55854817088218).

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

51061306665530 is a wasteful number, since it uses less digits than its factorization.

51061306665530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104206748318 (or 104206748311 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 47.

The spelling of 51061306665530 in words is "fifty-one trillion, sixty-one billion, three hundred six million, six hundred sixty-five thousand, five hundred thirty".