51615222420 has 48 divisors (see below), whose sum is σ = 144532563840. Its totient is φ = 13763112576.

The previous prime is 51615222419. The next prime is 51615222437. The reversal of 51615222420 is 2422251615.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1525446 + ... + 1558914.

It is an arithmetic number, because the mean of its divisors is an integer number (3011095080).

Almost surely, 2^51615222420 is an apocalyptic number.

It is an amenable number.

51615222420 is an abundant number, since it is smaller than the sum of its proper divisors (92917341420).

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

51615222420 is a wasteful number, since it uses less digits than its factorization.

51615222420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59184 (or 59182 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 51615222420 in words is "fifty-one billion, six hundred fifteen million, two hundred twenty-two thousand, four hundred twenty".