51155571516 has 24 divisors (see below), whose sum is σ = 136414857600. Its totient is φ = 14615877552.

The previous prime is 51155571473. The next prime is 51155571517. The reversal of 51155571516 is 61517555115.

51155571516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155571517) 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, 304497366 + ... + 304497533.

It is an arithmetic number, because the mean of its divisors is an integer number (5683952400).

Almost surely, 2^51155571516 is an apocalyptic number.

It is an amenable number.

51155571516 is an abundant number, since it is smaller than the sum of its proper divisors (85259286084).

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

51155571516 is a wasteful number, since it uses less digits than its factorization.

51155571516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608994913 (or 608994911 counting only the distinct ones).

The product of its digits is 131250, while the sum is 42.

The spelling of 51155571516 in words is "fifty-one billion, one hundred fifty-five million, five hundred seventy-one thousand, five hundred sixteen".