51864666340 has 24 divisors (see below), whose sum is σ = 110139576120. Its totient is φ = 20512766208.

The previous prime is 51864666253. The next prime is 51864666349. The reversal of 51864666340 is 4366646815.

It can be written as a sum of positive squares in 4 ways, for example, as 9911795364 + 41952870976 = 99558^2 + 204824^2 .

It is a super-2 number, since 2×51864666340² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51864666349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14566947 + ... + 14570506.

It is an arithmetic number, because the mean of its divisors is an integer number (4589149005).

Almost surely, 2^51864666340 is an apocalyptic number.

It is an amenable number.

51864666340 is an abundant number, since it is smaller than the sum of its proper divisors (58274909780).

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

51864666340 is a wasteful number, since it uses less digits than its factorization.

51864666340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29137551 (or 29137549 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 51864666340 in words is "fifty-one billion, eight hundred sixty-four million, six hundred sixty-six thousand, three hundred forty".