51611655105 has 48 divisors (see below), whose sum is σ = 92765846160. Its totient is φ = 26513625600.

The previous prime is 51611655097. The next prime is 51611655113. The reversal of 51611655105 is 50155611615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51611655097) and next prime (51611655113).

It can be written as a sum of positive squares in 8 ways, for example, as 14133405456 + 37478249649 = 118884^2 + 193593^2 .

It is not a de Polignac number, because 51611655105 - 2³ = 51611655097 is a prime.

It is a super-2 number, since 2×51611655105² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51611655105.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 502435 + ... + 596375.

It is an arithmetic number, because the mean of its divisors is an integer number (1932621795).

Almost surely, 2^51611655105 is an apocalyptic number.

It is an amenable number.

51611655105 is a deficient number, since it is larger than the sum of its proper divisors (41154191055).

51611655105 is a wasteful number, since it uses less digits than its factorization.

51611655105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94402 (or 94399 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 51611655105 in words is "fifty-one billion, six hundred eleven million, six hundred fifty-five thousand, one hundred five".