51030981318 has 32 divisors (see below), whose sum is σ = 108206582400. Its totient is φ = 15999106176.

The previous prime is 51030981311. The next prime is 51030981329. The reversal of 51030981318 is 81318903015.

It is a super-2 number, since 2×51030981318² (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 (51030981311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1594371 + ... + 1626062.

It is an arithmetic number, because the mean of its divisors is an integer number (3381455700).

Almost surely, 2^51030981318 is an apocalyptic number.

51030981318 is an abundant number, since it is smaller than the sum of its proper divisors (57175601082).

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

51030981318 is a wasteful number, since it uses less digits than its factorization.

51030981318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220596.

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 51030981318 in words is "fifty-one billion, thirty million, nine hundred eighty-one thousand, three hundred eighteen".