51216340556 has 12 divisors (see below), whose sum is σ = 90450877440. Its totient is φ = 25373232720.

The previous prime is 51216340507. The next prime is 51216340579. The reversal of 51216340556 is 65504361215.

It is a super-2 number, since 2×51216340556² (a number of 22 digits) contains 22 as substring.

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, 58733900 + ... + 58734771.

It is an arithmetic number, because the mean of its divisors is an integer number (7537573120).

Almost surely, 2^51216340556 is an apocalyptic number.

It is an amenable number.

51216340556 is a deficient number, since it is larger than the sum of its proper divisors (39234536884).

51216340556 is a wasteful number, since it uses less digits than its factorization.

51216340556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117468784 (or 117468782 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 51216340556 in words is "fifty-one billion, two hundred sixteen million, three hundred forty thousand, five hundred fifty-six".