51393349215 has 24 divisors (see below), whose sum is σ = 95934252960. Its totient is φ = 25301340864.

The previous prime is 51393349211. The next prime is 51393349229. The reversal of 51393349215 is 51294339315.

51393349215 is a `hidden beast` number, since 5 + 1 + 3 + 93 + 349 + 215 = 666.

It is not a de Polignac number, because 51393349215 - 2² = 51393349211 is a prime.

It is a super-2 number, since 2×51393349215² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51393349211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43925355 + ... + 43926524.

It is an arithmetic number, because the mean of its divisors is an integer number (3997260540).

Almost surely, 2^51393349215 is an apocalyptic number.

51393349215 is a deficient number, since it is larger than the sum of its proper divisors (44540903745).

51393349215 is a wasteful number, since it uses less digits than its factorization.

51393349215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87851903 (or 87851900 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The spelling of 51393349215 in words is "fifty-one billion, three hundred ninety-three million, three hundred forty-nine thousand, two hundred fifteen".