2641655641 has 4 divisors (see below), whose sum is σ = 2675094400. Its totient is φ = 2608216884.

The previous prime is 2641655623. The next prime is 2641655647. The reversal of 2641655641 is 1465561462.

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 2641655641 - 2⁵ = 2641655609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2641655594 and 2641655603.

It is not an unprimeable number, because it can be changed into a prime (2641655647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16719261 + ... + 16719418.

It is an arithmetic number, because the mean of its divisors is an integer number (668773600).

Almost surely, 2^2641655641 is an apocalyptic number.

It is an amenable number.

2641655641 is a deficient number, since it is larger than the sum of its proper divisors (33438759).

2641655641 is an equidigital number, since it uses as much as digits as its factorization.

2641655641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33438758.

The product of its digits is 172800, while the sum is 40.

The square root of 2641655641 is about 51397.0392240643. The cubic root of 2641655641 is about 1382.3735043136.

The spelling of 2641655641 in words is "two billion, six hundred forty-one million, six hundred fifty-five thousand, six hundred forty-one".