51513432420 has 48 divisors (see below), whose sum is σ = 144247561920. Its totient is φ = 13735967616.

The previous prime is 51513432407. The next prime is 51513432427. The reversal of 51513432420 is 2423431515.

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 (51513432427) 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, 1501579 + ... + 1535501.

It is an arithmetic number, because the mean of its divisors is an integer number (3005157540).

Almost surely, 2^51513432420 is an apocalyptic number.

It is an amenable number.

51513432420 is an abundant number, since it is smaller than the sum of its proper divisors (92734129500).

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

51513432420 is a wasteful number, since it uses less digits than its factorization.

51513432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59244 (or 59242 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 51513432420 its reverse (2423431515), we get a palindrome (53936863935).

The spelling of 51513432420 in words is "fifty-one billion, five hundred thirteen million, four hundred thirty-two thousand, four hundred twenty".