51651551012 has 12 divisors (see below), whose sum is σ = 90405804636. Its totient is φ = 25821321120.

The previous prime is 51651550999. The next prime is 51651551041. The reversal of 51651551012 is 21015515615.

It can be written as a sum of positive squares in 2 ways, for example, as 15179718436 + 36471832576 = 123206^2 + 190976^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51651551012.

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, 1087439 + ... + 1133942.

It is an arithmetic number, because the mean of its divisors is an integer number (7533817053).

Almost surely, 2^51651551012 is an apocalyptic number.

It is an amenable number.

51651551012 is a deficient number, since it is larger than the sum of its proper divisors (38754253624).

51651551012 is a wasteful number, since it uses less digits than its factorization.

51651551012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227198 (or 2227196 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 32.

The spelling of 51651551012 in words is "fifty-one billion, six hundred fifty-one million, five hundred fifty-one thousand, twelve".