51515233451 has 12 divisors (see below), whose sum is σ = 56971591656. Its totient is φ = 46544699520.

The previous prime is 51515233447. The next prime is 51515233487. The reversal of 51515233451 is 15433251515.

It is not a de Polignac number, because 51515233451 - 2² = 51515233447 is a prime.

It is a super-2 number, since 2×51515233451² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51515233151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1286246 + ... + 1325691.

It is an arithmetic number, because the mean of its divisors is an integer number (4747632638).

Almost surely, 2^51515233451 is an apocalyptic number.

51515233451 is a deficient number, since it is larger than the sum of its proper divisors (5456358205).

51515233451 is a wasteful number, since it uses less digits than its factorization.

51515233451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612122 (or 2612111 counting only the distinct ones).

The product of its digits is 45000, while the sum is 35.

Adding to 51515233451 its reverse (15433251515), we get a palindrome (66948484966).

The spelling of 51515233451 in words is "fifty-one billion, five hundred fifteen million, two hundred thirty-three thousand, four hundred fifty-one".