51515203025 has 96 divisors (see below), whose sum is σ = 80297777280. Its totient is φ = 32223744000.

The previous prime is 51515203013. The next prime is 51515203027. The reversal of 51515203025 is 52030251515.

It is not a de Polignac number, because 51515203025 - 2¹² = 51515198929 is a prime.

It is a super-2 number, since 2×51515203025² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51515203027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4137209 + ... + 4149641.

It is an arithmetic number, because the mean of its divisors is an integer number (836435180).

Almost surely, 2^51515203025 is an apocalyptic number.

51515203025 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51515203025 is a deficient number, since it is larger than the sum of its proper divisors (28782574255).

51515203025 is a wasteful number, since it uses less digits than its factorization.

51515203025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12547 (or 12542 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 51515203025 in words is "fifty-one billion, five hundred fifteen million, two hundred three thousand, twenty-five".