51121560668 has 12 divisors (see below), whose sum is σ = 90106348920. Its totient is φ = 25376889552.

The previous prime is 51121560661. The next prime is 51121560689. The reversal of 51121560668 is 86606512115.

It is a super-2 number, since 2×51121560668² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121560661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45972071 + ... + 45973182.

It is an arithmetic number, because the mean of its divisors is an integer number (7508862410).

Almost surely, 2^51121560668 is an apocalyptic number.

It is an amenable number.

51121560668 is a deficient number, since it is larger than the sum of its proper divisors (38984788252).

51121560668 is a wasteful number, since it uses less digits than its factorization.

51121560668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91945396 (or 91945394 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 51121560668 in words is "fifty-one billion, one hundred twenty-one million, five hundred sixty thousand, six hundred sixty-eight".