2611562661 has 48 divisors (see below), whose sum is σ = 4197991680. Its totient is φ = 1603537920.

The previous prime is 2611562659. The next prime is 2611562671. The reversal of 2611562661 is 1662651162.

2611562661 is a `hidden beast` number, since 26 + 1 + 1 + 5 + 626 + 6 + 1 = 666.

It is not a de Polignac number, because 2611562661 - 2¹ = 2611562659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2611562671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 363181 + ... + 370301.

It is an arithmetic number, because the mean of its divisors is an integer number (87458160).

Almost surely, 2^2611562661 is an apocalyptic number.

It is an amenable number.

2611562661 is a deficient number, since it is larger than the sum of its proper divisors (1586429019).

2611562661 is a wasteful number, since it uses less digits than its factorization.

2611562661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7211 (or 7188 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 2611562661 is about 51103.4505782144. The cubic root of 2611562661 is about 1377.1042445086.

The spelling of 2611562661 in words is "two billion, six hundred eleven million, five hundred sixty-two thousand, six hundred sixty-one".