63891789778756 has 27 divisors (see below), whose sum is σ = 113506258049247. Its totient is φ = 31468562934600.

The previous prime is 63891789778727. The next prime is 63891789778759. The reversal of 63891789778756 is 65787798719836.

The square root of 63891789778756 is 7993234.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×63891789778756² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63891789778759) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1071063531 + ... + 1071123181.

Almost surely, 2^{63891789778756} is an apocalyptic number.

63891789778756 is the 7993234-th square number.

It is an amenable number.

63891789778756 is a deficient number, since it is larger than the sum of its proper divisors (49614468270491).

63891789778756 is an frugal number, since it uses more digits than its factorization.

63891789778756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119440 (or 59720 counting only the distinct ones).

The product of its digits is 53770106880, while the sum is 91.

The spelling of 63891789778756 in words is "sixty-three trillion, eight hundred ninety-one billion, seven hundred eighty-nine million, seven hundred seventy-eight thousand, seven hundred fifty-six".