77813413758581 has 16 divisors (see below), whose sum is σ = 88417356451200. Its totient is φ = 68081364445248.

The previous prime is 77813413758559. The next prime is 77813413758593. The reversal of 77813413758581 is 18585731431877.

It is a cyclic number.

It is not a de Polignac number, because 77813413758581 - 2⁴² = 73415367247477 is a prime.

It is a super-2 number, since 2×77813413758581² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77813413758511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3070034426 + ... + 3070059771.

It is an arithmetic number, because the mean of its divisors is an integer number (5526084778200).

Almost surely, 2^{77813413758581} is an apocalyptic number.

It is an amenable number.

77813413758581 is a deficient number, since it is larger than the sum of its proper divisors (10603942692619).

77813413758581 is a wasteful number, since it uses less digits than its factorization.

77813413758581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140094268.

The product of its digits is 158054400, while the sum is 68.

The spelling of 77813413758581 in words is "seventy-seven trillion, eight hundred thirteen billion, four hundred thirteen million, seven hundred fifty-eight thousand, five hundred eighty-one".