51619736678399 has 4 divisors (see below), whose sum is σ = 51637555023264. Its totient is φ = 51601918333536.

The previous prime is 51619736678357. The next prime is 51619736678437. The reversal of 51619736678399 is 99387663791615.

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 51619736678399 - 2⁴⁰ = 50520225050623 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 (51619736678329) 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, 8909168087 + ... + 8909173880.

It is an arithmetic number, because the mean of its divisors is an integer number (12909388755816).

Almost surely, 2^{51619736678399} is an apocalyptic number.

51619736678399 is a deficient number, since it is larger than the sum of its proper divisors (17818344865).

51619736678399 is a wasteful number, since it uses less digits than its factorization.

51619736678399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17818344864.

The product of its digits is 2777664960, while the sum is 80.

The spelling of 51619736678399 in words is "fifty-one trillion, six hundred nineteen billion, seven hundred thirty-six million, six hundred seventy-eight thousand, three hundred ninety-nine".