77399419717636 has 27 divisors (see below), whose sum is σ = 135775887233301. Its totient is φ = 38606533481664.

The previous prime is 77399419717601. The next prime is 77399419717639. The reversal of 77399419717636 is 63671791499377.

The square root of 77399419717636 is 8797694.

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

It can be written as a sum of positive squares in only one way, i.e., 8679564132100 + 68719855585536 = 2946110^2 + 8289744^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77399419717639) 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 8 ways as a sum of consecutive naturals, for example, 7618797925 + ... + 7618808083.

Almost surely, 2^{77399419717636} is an apocalyptic number.

77399419717636 is the 8797694-th square number.

It is an amenable number.

77399419717636 is a deficient number, since it is larger than the sum of its proper divisors (58376467515665).

77399419717636 is an frugal number, since it uses more digits than its factorization.

77399419717636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21188 (or 10594 counting only the distinct ones).

The product of its digits is 2268426384, while the sum is 79.

The spelling of 77399419717636 in words is "seventy-seven trillion, three hundred ninety-nine billion, four hundred nineteen million, seven hundred seventeen thousand, six hundred thirty-six".