51135523415 has 4 divisors (see below), whose sum is σ = 61362628104. Its totient is φ = 40908418728.

The previous prime is 51135523399. The next prime is 51135523423. The reversal of 51135523415 is 51432553115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51135523415 - 2⁴ = 51135523399 is a prime.

It is a super-2 number, since 2×51135523415² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5113552337 + ... + 5113552346.

It is an arithmetic number, because the mean of its divisors is an integer number (15340657026).

Almost surely, 2^51135523415 is an apocalyptic number.

51135523415 is a deficient number, since it is larger than the sum of its proper divisors (10227104689).

51135523415 is a wasteful number, since it uses less digits than its factorization.

51135523415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10227104688.

The product of its digits is 45000, while the sum is 35.

The spelling of 51135523415 in words is "fifty-one billion, one hundred thirty-five million, five hundred twenty-three thousand, four hundred fifteen".