51450431250 has 96 divisors (see below), whose sum is σ = 129871437696. Its totient is φ = 13586400000.

The previous prime is 51450431177. The next prime is 51450431257. The reversal of 51450431250 is 5213405415.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51450431257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1917930 + ... + 1944570.

It is an arithmetic number, because the mean of its divisors is an integer number (1352827476).

Almost surely, 2^51450431250 is an apocalyptic number.

51450431250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51450431250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64935718848).

51450431250 is an abundant number, since it is smaller than the sum of its proper divisors (78421006446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51450431250 is a wasteful number, since it uses less digits than its factorization.

51450431250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26774 (or 26754 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 51450431250 its reverse (5213405415), we get a palindrome (56663836665).

The spelling of 51450431250 in words is "fifty-one billion, four hundred fifty million, four hundred thirty-one thousand, two hundred fifty".