51601688516999 has 4 divisors (see below), whose sum is σ = 52112596324200. Its totient is φ = 51090780709800.

The previous prime is 51601688516971. The next prime is 51601688517031. The reversal of 51601688516999 is 99961588610615.

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 51601688516999 - 2¹⁶ = 51601688451463 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 (51601688716999) 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, 255453903449 + ... + 255453903650.

It is an arithmetic number, because the mean of its divisors is an integer number (13028149081050).

Almost surely, 2^{51601688516999} is an apocalyptic number.

51601688516999 is a deficient number, since it is larger than the sum of its proper divisors (510907807201).

51601688516999 is a wasteful number, since it uses less digits than its factorization.

51601688516999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510907807200.

The product of its (nonzero) digits is 251942400, while the sum is 74.

The spelling of 51601688516999 in words is "fifty-one trillion, six hundred one billion, six hundred eighty-eight million, five hundred sixteen thousand, nine hundred ninety-nine".