51949614356639 has 4 divisors (see below), whose sum is σ = 52033539420840. Its totient is φ = 51865689292440.

The previous prime is 51949614356623. The next prime is 51949614356641. The reversal of 51949614356639 is 93665341694915.

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 51949614356639 - 2⁴ = 51949614356623 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 (51949614356609) 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, 41962531172 + ... + 41962532409.

It is an arithmetic number, because the mean of its divisors is an integer number (13008384855210).

Almost surely, 2^{51949614356639} is an apocalyptic number.

51949614356639 is a deficient number, since it is larger than the sum of its proper divisors (83925064201).

51949614356639 is an equidigital number, since it uses as much as digits as its factorization.

51949614356639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83925064200.

The product of its digits is 566870400, while the sum is 71.

The spelling of 51949614356639 in words is "fifty-one trillion, nine hundred forty-nine billion, six hundred fourteen million, three hundred fifty-six thousand, six hundred thirty-nine".