51511315504501 has 4 divisors (see below), whose sum is σ = 52011425363872. Its totient is φ = 51011205645132.

The previous prime is 51511315504499. The next prime is 51511315504507. The reversal of 51511315504501 is 10540551311515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51511315504501 - 2¹ = 51511315504499 is a prime.

It is a super-2 number, since 2×51511315504501² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511315504507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250054929531 + ... + 250054929736.

It is an arithmetic number, because the mean of its divisors is an integer number (13002856340968).

Almost surely, 2^{51511315504501} is an apocalyptic number.

It is an amenable number.

51511315504501 is a deficient number, since it is larger than the sum of its proper divisors (500109859371).

51511315504501 is a wasteful number, since it uses less digits than its factorization.

51511315504501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500109859370.

The product of its (nonzero) digits is 37500, while the sum is 37.

The spelling of 51511315504501 in words is "fifty-one trillion, five hundred eleven billion, three hundred fifteen million, five hundred four thousand, five hundred one".