51109988730 has 32 divisors (see below), whose sum is σ = 124978391424. Its totient is φ = 13372172736.

The previous prime is 51109988723. The next prime is 51109988737. The reversal of 51109988730 is 3788990115.

It is an interprime number because it is at equal distance from previous prime (51109988723) and next prime (51109988737).

It is a super-2 number, since 2×51109988730² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51109988737) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16070734 + ... + 16073913.

It is an arithmetic number, because the mean of its divisors is an integer number (3905574732).

Almost surely, 2^51109988730 is an apocalyptic number.

51109988730 is an abundant number, since it is smaller than the sum of its proper divisors (73868402694).

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

51109988730 is a wasteful number, since it uses less digits than its factorization.

51109988730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32144710.

The product of its (nonzero) digits is 544320, while the sum is 51.

The spelling of 51109988730 in words is "fifty-one billion, one hundred nine million, nine hundred eighty-eight thousand, seven hundred thirty".