51011110605 has 512 divisors, whose sum is σ = 119140761600. Its totient is φ = 18011455488.

The previous prime is 51011110597. The next prime is 51011110627. The reversal of 51011110605 is 50601111015.

It is a happy number.

It is not a de Polignac number, because 51011110605 - 2³ = 51011110597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 864595066 + ... + 864595124.

It is an arithmetic number, because the mean of its divisors is an integer number (232696800).

Almost surely, 2^51011110605 is an apocalyptic number.

It is an amenable number.

51011110605 is an abundant number, since it is smaller than the sum of its proper divisors (68129650995).

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

51011110605 is a wasteful number, since it uses less digits than its factorization.

51011110605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213.

The product of its (nonzero) digits is 150, while the sum is 21.

The spelling of 51011110605 in words is "fifty-one billion, eleven million, one hundred ten thousand, six hundred five".