51503503300 has 72 divisors (see below), whose sum is σ = 117690904800. Its totient is φ = 19509477120.

The previous prime is 51503503283. The next prime is 51503503309. The reversal of 51503503300 is 330530515.

It is a happy number.

It is a super-2 number, since 2×51503503300² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51503503309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8134536 + ... + 8140864.

It is an arithmetic number, because the mean of its divisors is an integer number (1634595900).

Almost surely, 2^51503503300 is an apocalyptic number.

51503503300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51503503300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58845452400).

51503503300 is an abundant number, since it is smaller than the sum of its proper divisors (66187401500).

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

51503503300 is a wasteful number, since it uses less digits than its factorization.

51503503300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10645 (or 10638 counting only the distinct ones).

The product of its (nonzero) digits is 3375, while the sum is 25.

The spelling of 51503503300 in words is "fifty-one billion, five hundred three million, five hundred three thousand, three hundred".