7957661 has 4 divisors (see below), whose sum is σ = 7979712. Its totient is φ = 7935612.

The previous prime is 7957619. The next prime is 7957667. The reversal of 7957661 is 1667597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7957661 - 2⁶ = 7957597 is a prime.

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 (7957667) 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, 10475 + ... + 11208.

It is an arithmetic number, because the mean of its divisors is an integer number (1994928).

Almost surely, 2^7957661 is an apocalyptic number.

It is an amenable number.

7957661 is a deficient number, since it is larger than the sum of its proper divisors (22051).

7957661 is a wasteful number, since it uses less digits than its factorization.

7957661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22050.

The product of its digits is 79380, while the sum is 41.

The square root of 7957661 is about 2820.9326471931. The cubic root of 7957661 is about 199.6465507360.

Subtracting from 7957661 its reverse (1667597), we obtain a square (6290064 = 2508²).

The spelling of 7957661 in words is "seven million, nine hundred fifty-seven thousand, six hundred sixty-one".