7866444961 has 4 divisors (see below), whose sum is σ = 8280468400. Its totient is φ = 7452421524.

The previous prime is 7866444953. The next prime is 7866444979. The reversal of 7866444961 is 1694446687.

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 7866444961 - 2³ = 7866444953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7866414961) 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, 207011691 + ... + 207011728.

It is an arithmetic number, because the mean of its divisors is an integer number (2070117100).

Almost surely, 2^7866444961 is an apocalyptic number.

It is an amenable number.

7866444961 is a deficient number, since it is larger than the sum of its proper divisors (414023439).

7866444961 is a wasteful number, since it uses less digits than its factorization.

7866444961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414023438.

The product of its digits is 6967296, while the sum is 55.

The square root of 7866444961 is about 88692.9814641497. The cubic root of 7866444961 is about 1988.8078986805.

The spelling of 7866444961 in words is "seven billion, eight hundred sixty-six million, four hundred forty-four thousand, nine hundred sixty-one".