51111776880 has 120 divisors (see below), whose sum is σ = 180684663120. Its totient is φ = 12912445440.

The previous prime is 51111776879. The next prime is 51111776923. The reversal of 51111776880 is 8867711115.

It is a happy number.

51111776880 is a `hidden beast` number, since 511 + 1 + 1 + 77 + 68 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×51111776880² (a number of 22 digits) contains 22 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 23 ways as a sum of consecutive naturals, for example, 1854441 + ... + 1881800.

It is an arithmetic number, because the mean of its divisors is an integer number (1505705526).

Almost surely, 2^51111776880 is an apocalyptic number.

It is an amenable number.

51111776880 is an abundant number, since it is smaller than the sum of its proper divisors (129572886240).

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

51111776880 is a wasteful number, since it uses less digits than its factorization.

51111776880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736279 (or 3736270 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 45.

The spelling of 51111776880 in words is "fifty-one billion, one hundred eleven million, seven hundred seventy-six thousand, eight hundred eighty".