51251046660 has 72 divisors (see below), whose sum is σ = 169594379136. Its totient is φ = 12424495680.

The previous prime is 51251046521. The next prime is 51251046661. The reversal of 51251046660 is 6664015215.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51251046661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12940204 + ... + 12944163.

It is an arithmetic number, because the mean of its divisors is an integer number (2355477488).

Almost surely, 2^51251046660 is an apocalyptic number.

It is an amenable number.

51251046660 is an abundant number, since it is smaller than the sum of its proper divisors (118343332476).

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

51251046660 is a wasteful number, since it uses less digits than its factorization.

51251046660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25884393 (or 25884388 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 51251046660 in words is "fifty-one billion, two hundred fifty-one million, forty-six thousand, six hundred sixty".