51111506356 has 24 divisors (see below), whose sum is σ = 90296640000. Its totient is φ = 25313423904.

The previous prime is 51111506311. The next prime is 51111506371. The reversal of 51111506356 is 65360511115.

It is a super-2 number, since 2×51111506356² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94525 + ... + 333403.

It is an arithmetic number, because the mean of its divisors is an integer number (3762360000).

Almost surely, 2^51111506356 is an apocalyptic number.

It is an amenable number.

51111506356 is a deficient number, since it is larger than the sum of its proper divisors (39185133644).

51111506356 is a wasteful number, since it uses less digits than its factorization.

51111506356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239391 (or 239389 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 34.

The spelling of 51111506356 in words is "fifty-one billion, one hundred eleven million, five hundred six thousand, three hundred fifty-six".