51189868458 has 32 divisors (see below), whose sum is σ = 113763424320. Its totient is φ = 17062065360.

The previous prime is 51189868453. The next prime is 51189868469. The reversal of 51189868458 is 85486898115.

51189868458 is a `hidden beast` number, since 5 + 118 + 9 + 8 + 68 + 458 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 51189868395 and 51189868404.

It is not an unprimeable number, because it can be changed into a prime (51189868453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032616 + ... + 1081052.

It is an arithmetic number, because the mean of its divisors is an integer number (3555107010).

Almost surely, 2^51189868458 is an apocalyptic number.

51189868458 is an abundant number, since it is smaller than the sum of its proper divisors (62573555862).

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

51189868458 is a wasteful number, since it uses less digits than its factorization.

51189868458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68019 (or 68013 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 63.

The spelling of 51189868458 in words is "fifty-one billion, one hundred eighty-nine million, eight hundred sixty-eight thousand, four hundred fifty-eight".