51550770996 has 18 divisors (see below), whose sum is σ = 130308893442. Its totient is φ = 17183590320.

The previous prime is 51550770991. The next prime is 51550771009. The reversal of 51550770996 is 69907705515.

51550770996 is a `hidden beast` number, since 515 + 50 + 7 + 70 + 9 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50113299600 + 1437471396 = 223860^2 + 37914^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550770991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 715982895 + ... + 715982966.

It is an arithmetic number, because the mean of its divisors is an integer number (7239382969).

Almost surely, 2^51550770996 is an apocalyptic number.

It is an amenable number.

51550770996 is an abundant number, since it is smaller than the sum of its proper divisors (78758122446).

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

51550770996 is a wasteful number, since it uses less digits than its factorization.

51550770996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431965871 (or 1431965866 counting only the distinct ones).

The product of its (nonzero) digits is 2976750, while the sum is 54.

The spelling of 51550770996 in words is "fifty-one billion, five hundred fifty million, seven hundred seventy thousand, nine hundred ninety-six".