51115651634 has 12 divisors (see below), whose sum is σ = 77263290942. Its totient is φ = 25362710880.

The previous prime is 51115651579. The next prime is 51115651649. The reversal of 51115651634 is 43615651115.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 40540614409 + 10575037225 = 201347^2 + 102835^2 .

It is a super-2 number, since 2×51115651634² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710327 + ... + 778970.

Almost surely, 2^51115651634 is an apocalyptic number.

51115651634 is a deficient number, since it is larger than the sum of its proper divisors (26147639308).

51115651634 is a wasteful number, since it uses less digits than its factorization.

51115651634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489561 (or 1489430 counting only the distinct ones).

The product of its digits is 54000, while the sum is 38.

The spelling of 51115651634 in words is "fifty-one billion, one hundred fifteen million, six hundred fifty-one thousand, six hundred thirty-four".