51241865940 has 36 divisors (see below), whose sum is σ = 155433660564. Its totient is φ = 13664497536.

The previous prime is 51241865933. The next prime is 51241865951. The reversal of 51241865940 is 4956814215.

51241865940 is a `hidden beast` number, since 5 + 12 + 41 + 8 + 6 + 594 + 0 = 666.

51241865940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38217122064 + 13024743876 = 195492^2 + 114126^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×51241865940³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 142338337 + ... + 142338696.

Almost surely, 2^51241865940 is an apocalyptic number.

It is an amenable number.

51241865940 is an abundant number, since it is smaller than the sum of its proper divisors (104191794624).

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

51241865940 is a wasteful number, since it uses less digits than its factorization.

51241865940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284677048 (or 284677043 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 51241865940 in words is "fifty-one billion, two hundred forty-one million, eight hundred sixty-five thousand, nine hundred forty".