51291612626 has 8 divisors (see below), whose sum is σ = 77036952204. Its totient is φ = 25612628560.

The previous prime is 51291612571. The next prime is 51291612661. The reversal of 51291612626 is 62621619215.

It can be written as a sum of positive squares in 2 ways, for example, as 50760540601 + 531072025 = 225301^2 + 23045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 16586945 + ... + 16590036.

Almost surely, 2^51291612626 is an apocalyptic number.

51291612626 is a deficient number, since it is larger than the sum of its proper divisors (25745339578).

51291612626 is a wasteful number, since it uses less digits than its factorization.

51291612626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33177756.

The product of its digits is 77760, while the sum is 41.

The spelling of 51291612626 in words is "fifty-one billion, two hundred ninety-one million, six hundred twelve thousand, six hundred twenty-six".