51111005005 has 24 divisors (see below), whose sum is σ = 65802733920. Its totient is φ = 38005680960.

The previous prime is 51111004949. The next prime is 51111005047. The reversal of 51111005005 is 50050011115.

It is a happy number.

It is not a de Polignac number, because 51111005005 - 2²¹ = 51108907853 is a prime.

It is a super-2 number, since 2×51111005005² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171090 + ... + 362620.

It is an arithmetic number, because the mean of its divisors is an integer number (2741780580).

Almost surely, 2^51111005005 is an apocalyptic number.

It is an amenable number.

51111005005 is a deficient number, since it is larger than the sum of its proper divisors (14691728915).

51111005005 is a wasteful number, since it uses less digits than its factorization.

51111005005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191661 (or 191608 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 19.

The spelling of 51111005005 in words is "fifty-one billion, one hundred eleven million, five thousand, five".