51210630064639 has 4 divisors (see below), whose sum is σ = 51680452358920. Its totient is φ = 50740807770360.

The previous prime is 51210630064609. The next prime is 51210630064687. The reversal of 51210630064639 is 93646003601215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51210630064639 - 2²¹ = 51210627967487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51210630064609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234911146977 + ... + 234911147194.

It is an arithmetic number, because the mean of its divisors is an integer number (12920113089730).

Almost surely, 2^{51210630064639} is an apocalyptic number.

51210630064639 is a deficient number, since it is larger than the sum of its proper divisors (469822294281).

51210630064639 is a wasteful number, since it uses less digits than its factorization.

51210630064639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469822294280.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 51210630064639 in words is "fifty-one trillion, two hundred ten billion, six hundred thirty million, sixty-four thousand, six hundred thirty-nine".