51640663041212 has 36 divisors (see below), whose sum is σ = 109003283227440. Its totient is φ = 20966885741952.

The previous prime is 51640663041181. The next prime is 51640663041277. The reversal of 51640663041212 is 21214036604615.

It is a self number, because there is not a number n which added to its sum of digits gives 51640663041212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2554435037 + ... + 2554455252.

It is an arithmetic number, because the mean of its divisors is an integer number (3027868978540).

Almost surely, 2^{51640663041212} is an apocalyptic number.

It is an amenable number.

51640663041212 is an abundant number, since it is smaller than the sum of its proper divisors (57362620186228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51640663041212 is a wasteful number, since it uses less digits than its factorization.

51640663041212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108890338 (or 5108890317 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

Adding to 51640663041212 its reverse (21214036604615), we get a palindrome (72854699645827).

The spelling of 51640663041212 in words is "fifty-one trillion, six hundred forty billion, six hundred sixty-three million, forty-one thousand, two hundred twelve".