51618055212 has 72 divisors (see below), whose sum is σ = 137380042800. Its totient is φ = 16296432768.

The previous prime is 51618055183. The next prime is 51618055243. The reversal of 51618055212 is 21255081615.

51618055212 is a `hidden beast` number, since 5 + 16 + 1 + 80 + 552 + 12 = 666.

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 23 ways as a sum of consecutive naturals, for example, 4117578 + ... + 4130094.

It is an arithmetic number, because the mean of its divisors is an integer number (1908056150).

Almost surely, 2^51618055212 is an apocalyptic number.

It is an amenable number.

51618055212 is an abundant number, since it is smaller than the sum of its proper divisors (85761987588).

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

51618055212 is a wasteful number, since it uses less digits than its factorization.

51618055212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18575 (or 18570 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 51618055212 in words is "fifty-one billion, six hundred eighteen million, fifty-five thousand, two hundred twelve".