2642104661 has 4 divisors (see below), whose sum is σ = 3019548192. Its totient is φ = 2264661132.

The previous prime is 2642104649. The next prime is 2642104709. The reversal of 2642104661 is 1664012462.

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 a de Polignac number, because none of the positive numbers 2^k-2642104661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2642104561) 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, 188721755 + ... + 188721768.

It is an arithmetic number, because the mean of its divisors is an integer number (754887048).

Almost surely, 2^2642104661 is an apocalyptic number.

It is an amenable number.

2642104661 is a deficient number, since it is larger than the sum of its proper divisors (377443531).

2642104661 is an equidigital number, since it uses as much as digits as its factorization.

2642104661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377443530.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 2642104661 is about 51401.4071889087. The cubic root of 2642104661 is about 1382.4518236544.

The spelling of 2642104661 in words is "two billion, six hundred forty-two million, one hundred four thousand, six hundred sixty-one".