51501215112 has 32 divisors (see below), whose sum is σ = 128762083680. Its totient is φ = 17165865600.

The previous prime is 51501215083. The next prime is 51501215113. The reversal of 51501215112 is 21151210515.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51501215113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314487 + ... + 449337.

It is an arithmetic number, because the mean of its divisors is an integer number (4023815115).

Almost surely, 2^51501215112 is an apocalyptic number.

It is an amenable number.

51501215112 is an abundant number, since it is smaller than the sum of its proper divisors (77260868568).

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

51501215112 is a wasteful number, since it uses less digits than its factorization.

51501215112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150773 (or 150769 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 24.

Adding to 51501215112 its reverse (21151210515), we get a palindrome (72652425627).

The spelling of 51501215112 in words is "fifty-one billion, five hundred one million, two hundred fifteen thousand, one hundred twelve".