51913318399 has 8 divisors (see below), whose sum is σ = 52139373440. Its totient is φ = 51687633816.

The previous prime is 51913318397. The next prime is 51913318409. The reversal of 51913318399 is 99381331915.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51913318399 - 2¹ = 51913318397 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 (51913318397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190132 + ... + 374134.

It is an arithmetic number, because the mean of its divisors is an integer number (6517421680).

Almost surely, 2^51913318399 is an apocalyptic number.

51913318399 is a deficient number, since it is larger than the sum of its proper divisors (226055041).

51913318399 is a wasteful number, since it uses less digits than its factorization.

51913318399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185229.

The product of its digits is 787320, while the sum is 52.

The spelling of 51913318399 in words is "fifty-one billion, nine hundred thirteen million, three hundred eighteen thousand, three hundred ninety-nine".