51121560667 has 4 divisors (see below), whose sum is σ = 51154103016. Its totient is φ = 51089018320.

The previous prime is 51121560661. The next prime is 51121560689. The reversal of 51121560667 is 76606512115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51121560667 is a prime.

It is a super-2 number, since 2×51121560667² (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 (51121560661) 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, 16268818 + ... + 16271959.

It is an arithmetic number, because the mean of its divisors is an integer number (12788525754).

Almost surely, 2^51121560667 is an apocalyptic number.

51121560667 is a deficient number, since it is larger than the sum of its proper divisors (32542349).

51121560667 is a wasteful number, since it uses less digits than its factorization.

51121560667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32542348.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 51121560667 in words is "fifty-one billion, one hundred twenty-one million, five hundred sixty thousand, six hundred sixty-seven".