7930565911661 has 4 divisors (see below), whose sum is σ = 7981079070492. Its totient is φ = 7880052752832.

The previous prime is 7930565911649. The next prime is 7930565911721. The reversal of 7930565911661 is 1661195650397.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5754073525225 + 2176492386436 = 2398765^2 + 1475294^2 .

It is a cyclic number.

It is not a de Polignac number, because 7930565911661 - 2²² = 7930561717357 is a prime.

It is a super-3 number, since 3×7930565911661³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7930565911661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7930565971661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25256579180 + ... + 25256579493.

It is an arithmetic number, because the mean of its divisors is an integer number (1995269767623).

Almost surely, 2^{7930565911661} is an apocalyptic number.

It is an amenable number.

7930565911661 is a deficient number, since it is larger than the sum of its proper divisors (50513158831).

7930565911661 is a wasteful number, since it uses less digits than its factorization.

7930565911661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50513158830.

The product of its (nonzero) digits is 9185400, while the sum is 59.

The spelling of 7930565911661 in words is "seven trillion, nine hundred thirty billion, five hundred sixty-five million, nine hundred eleven thousand, six hundred sixty-one".