51111049959 has 24 divisors (see below), whose sum is σ = 78008261760. Its totient is φ = 32157894672.

The previous prime is 51111049943. The next prime is 51111049981. The reversal of 51111049959 is 95994011115.

It is a happy number.

51111049959 is a `hidden beast` number, since 511 + 1 + 1 + 0 + 49 + 95 + 9 = 666.

It is not a de Polignac number, because 51111049959 - 2⁴ = 51111049943 is a prime.

It is a super-2 number, since 2×51111049959² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111049459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 523269 + ... + 613214.

It is an arithmetic number, because the mean of its divisors is an integer number (3250344240).

Almost surely, 2^51111049959 is an apocalyptic number.

51111049959 is a deficient number, since it is larger than the sum of its proper divisors (26897211801).

51111049959 is a wasteful number, since it uses less digits than its factorization.

51111049959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136771 (or 1136768 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 45.

The spelling of 51111049959 in words is "fifty-one billion, one hundred eleven million, forty-nine thousand, nine hundred fifty-nine".