51555655515 has 96 divisors (see below), whose sum is σ = 106131574080. Its totient is φ = 21167225856.

The previous prime is 51555655511. The next prime is 51555655559.

51555655515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51555655515 - 2² = 51555655511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51555655511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 280621 + ... + 426449.

It is an arithmetic number, because the mean of its divisors is an integer number (1105537230).

Almost surely, 2^51555655515 is an apocalyptic number.

51555655515 is an abundant number, since it is smaller than the sum of its proper divisors (54575918565).

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

51555655515 is a wasteful number, since it uses less digits than its factorization.

51555655515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145901 (or 145894 counting only the distinct ones).

The product of its digits is 2343750, while the sum is 48.

The spelling of 51555655515 in words is "fifty-one billion, five hundred fifty-five million, six hundred fifty-five thousand, five hundred fifteen".