51615516243 has 16 divisors (see below), whose sum is σ = 71128627200. Its totient is φ = 33259122240.

The previous prime is 51615516233. The next prime is 51615516247. The reversal of 51615516243 is 34261551615.

It is not a de Polignac number, because 51615516243 - 2⁶ = 51615516179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51615516247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267783 + ... + 418256.

It is an arithmetic number, because the mean of its divisors is an integer number (4445539200).

Almost surely, 2^51615516243 is an apocalyptic number.

51615516243 is a deficient number, since it is larger than the sum of its proper divisors (19513110957).

51615516243 is a wasteful number, since it uses less digits than its factorization.

51615516243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686882.

The product of its digits is 108000, while the sum is 39.

The spelling of 51615516243 in words is "fifty-one billion, six hundred fifteen million, five hundred sixteen thousand, two hundred forty-three".