51531325503 has 16 divisors (see below), whose sum is σ = 78531346176. Its totient is φ = 29443688640.

The previous prime is 51531325501. The next prime is 51531325541. The reversal of 51531325503 is 30552313515.

It is a happy number.

It is not a de Polignac number, because 51531325503 - 2¹ = 51531325501 is a prime.

It is a super-2 number, since 2×51531325503² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531325501) 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, 122968 + ... + 343778.

It is an arithmetic number, because the mean of its divisors is an integer number (4908209136).

Almost surely, 2^51531325503 is an apocalyptic number.

51531325503 is a deficient number, since it is larger than the sum of its proper divisors (27000020673).

51531325503 is a wasteful number, since it uses less digits than its factorization.

51531325503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231934.

The product of its (nonzero) digits is 33750, while the sum is 33.

The spelling of 51531325503 in words is "fifty-one billion, five hundred thirty-one million, three hundred twenty-five thousand, five hundred three".