2641611665 has 16 divisors (see below), whose sum is σ = 3952126080. Its totient is φ = 1646718720.

The previous prime is 2641611659. The next prime is 2641611683. The reversal of 2641611665 is 5661161462.

It is a happy number.

It is not a de Polignac number, because 2641611665 - 2¹⁸ = 2641349521 is a prime.

It is a super-2 number, since 2×2641611665² = 13956224377328144450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3430280 + ... + 3431049.

It is an arithmetic number, because the mean of its divisors is an integer number (247007880).

Almost surely, 2^2641611665 is an apocalyptic number.

It is an amenable number.

2641611665 is a deficient number, since it is larger than the sum of its proper divisors (1310514415).

2641611665 is a wasteful number, since it uses less digits than its factorization.

2641611665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6861352.

The product of its digits is 51840, while the sum is 38.

The square root of 2641611665 is about 51396.6114155398. The cubic root of 2641611665 is about 1382.3658334180.

The spelling of 2641611665 in words is "two billion, six hundred forty-one million, six hundred eleven thousand, six hundred sixty-five".