51551610660 has 144 divisors (see below), whose sum is σ = 174218833152. Its totient is φ = 12231436800.

The previous prime is 51551610641. The next prime is 51551610689. The reversal of 51551610660 is 6601615515.

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

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, 183921 + ... + 370040.

It is an arithmetic number, because the mean of its divisors is an integer number (1209853008).

Almost surely, 2^51551610660 is an apocalyptic number.

It is an amenable number.

51551610660 is an abundant number, since it is smaller than the sum of its proper divisors (122667222492).

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

51551610660 is a wasteful number, since it uses less digits than its factorization.

51551610660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554034 (or 554029 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51551610660 in words is "fifty-one billion, five hundred fifty-one million, six hundred ten thousand, six hundred sixty".