7813905774661 has 12 divisors (see below), whose sum is σ = 9090662627820. Its totient is φ = 6696884053440.

The previous prime is 7813905774643. The next prime is 7813905774667. The reversal of 7813905774661 is 1664775093187.

It can be written as a sum of positive squares in 2 ways, for example, as 3914189221761 + 3899716552900 = 1978431^2 + 1974770^2 .

It is not a de Polignac number, because 7813905774661 - 2¹¹ = 7813905772613 is a prime.

It is a super-2 number, since 2×7813905774661² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7813905774593 and 7813905774602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7813905774667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8479656 + ... + 9355873.

It is an arithmetic number, because the mean of its divisors is an integer number (757555218985).

Almost surely, 2^{7813905774661} is an apocalyptic number.

It is an amenable number.

7813905774661 is a deficient number, since it is larger than the sum of its proper divisors (1276756853159).

7813905774661 is a wasteful number, since it uses less digits than its factorization.

7813905774661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17844484 (or 17844477 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 64.

The spelling of 7813905774661 in words is "seven trillion, eight hundred thirteen billion, nine hundred five million, seven hundred seventy-four thousand, six hundred sixty-one".