51515023323 has 16 divisors (see below), whose sum is σ = 73292228480. Its totient is φ = 32090105664.

The previous prime is 51515023321. The next prime is 51515023333. The reversal of 51515023323 is 32332051515.

It is not a de Polignac number, because 51515023323 - 2¹ = 51515023321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51515023321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6186061 + ... + 6194382.

It is an arithmetic number, because the mean of its divisors is an integer number (4580764280).

Almost surely, 2^51515023323 is an apocalyptic number.

51515023323 is a deficient number, since it is larger than the sum of its proper divisors (21777205157).

51515023323 is a wasteful number, since it uses less digits than its factorization.

51515023323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12380538.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 51515023323 its reverse (32332051515), we get a palindrome (83847074838).

The spelling of 51515023323 in words is "fifty-one billion, five hundred fifteen million, twenty-three thousand, three hundred twenty-three".