7891594661 has 4 divisors (see below), whose sum is σ = 7892652012. Its totient is φ = 7890537312.

The previous prime is 7891594649. The next prime is 7891594663. The reversal of 7891594661 is 1664951987.

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 5372157025 + 2519437636 = 73295^2 + 50194^2 .

It is a cyclic number.

It is not a de Polignac number, because 7891594661 - 2¹⁰ = 7891593637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7891594597 and 7891594606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7891594663) 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, 517400 + ... + 532433.

It is an arithmetic number, because the mean of its divisors is an integer number (1973163003).

Almost surely, 2^7891594661 is an apocalyptic number.

It is an amenable number.

7891594661 is a deficient number, since it is larger than the sum of its proper divisors (1057351).

7891594661 is a wasteful number, since it uses less digits than its factorization.

7891594661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057350.

The product of its digits is 3265920, while the sum is 56.

The square root of 7891594661 is about 88834.6478633196. The cubic root of 7891594661 is about 1990.9251071895.

The spelling of 7891594661 in words is "seven billion, eight hundred ninety-one million, five hundred ninety-four thousand, six hundred sixty-one".