2646645641 has 4 divisors (see below), whose sum is σ = 2785942800. Its totient is φ = 2507348484.

The previous prime is 2646645637. The next prime is 2646645689. The reversal of 2646645641 is 1465466462.

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 2646645641 - 2² = 2646645637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2646645592 and 2646645601.

It is not an unprimeable number, because it can be changed into a prime (2646645611) 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, 69648551 + ... + 69648588.

It is an arithmetic number, because the mean of its divisors is an integer number (696485700).

Almost surely, 2^2646645641 is an apocalyptic number.

It is an amenable number.

2646645641 is a deficient number, since it is larger than the sum of its proper divisors (139297159).

2646645641 is a wasteful number, since it uses less digits than its factorization.

2646645641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139297158.

The product of its digits is 829440, while the sum is 44.

The square root of 2646645641 is about 51445.5599736265. The cubic root of 2646645641 is about 1383.2433760764.

The spelling of 2646645641 in words is "two billion, six hundred forty-six million, six hundred forty-five thousand, six hundred forty-one".