51611516051 has 4 divisors (see below), whose sum is σ = 51612384504. Its totient is φ = 51610647600.

The previous prime is 51611516041. The next prime is 51611516053. The reversal of 51611516051 is 15061511615.

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 51611516051 - 2¹⁸ = 51611253907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51611515999 and 51611516017.

It is not an unprimeable number, because it can be changed into a prime (51611516053) 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, 337970 + ... + 466311.

It is an arithmetic number, because the mean of its divisors is an integer number (12903096126).

Almost surely, 2^51611516051 is an apocalyptic number.

51611516051 is a deficient number, since it is larger than the sum of its proper divisors (868453).

51611516051 is an equidigital number, since it uses as much as digits as its factorization.

51611516051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868452.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 51611516051 in words is "fifty-one billion, six hundred eleven million, five hundred sixteen thousand, fifty-one".