51120765515 has 8 divisors (see below), whose sum is σ = 61887794688. Its totient is φ = 40534695040.

The previous prime is 51120765511. The next prime is 51120765529. The reversal of 51120765515 is 51556702115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51120765515 - 2² = 51120765511 is a prime.

It is a super-2 number, since 2×51120765515² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51120765511) 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, 45239051 + ... + 45240180.

It is an arithmetic number, because the mean of its divisors is an integer number (7735974336).

Almost surely, 2^51120765515 is an apocalyptic number.

51120765515 is a deficient number, since it is larger than the sum of its proper divisors (10767029173).

51120765515 is a wasteful number, since it uses less digits than its factorization.

51120765515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90479349.

The product of its (nonzero) digits is 52500, while the sum is 38.

The spelling of 51120765515 in words is "fifty-one billion, one hundred twenty million, seven hundred sixty-five thousand, five hundred fifteen".