51511505065500 has 48 divisors (see below), whose sum is σ = 150001502755104. Its totient is φ = 13736401350400.

The previous prime is 51511505065487. The next prime is 51511505065541. The reversal of 51511505065500 is 556050511515.

It is a super-2 number, since 2×51511505065500² (a number of 28 digits) contains 22 as substring.

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, 17170500189 + ... + 17170503188.

It is an arithmetic number, because the mean of its divisors is an integer number (3125031307398).

Almost surely, 2^{51511505065500} is an apocalyptic number.

51511505065500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51511505065500 is an abundant number, since it is smaller than the sum of its proper divisors (98489997689604).

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

51511505065500 is a wasteful number, since it uses less digits than its factorization.

51511505065500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34341003399 (or 34341003387 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 39.

The spelling of 51511505065500 in words is "fifty-one trillion, five hundred eleven billion, five hundred five million, sixty-five thousand, five hundred".