2661432556 has 12 divisors (see below), whose sum is σ = 4658206168. Its totient is φ = 1330516512.

The previous prime is 2661432523. The next prime is 2661432601. The reversal of 2661432556 is 6552341662.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17646 + ... + 75061.

Almost surely, 2^2661432556 is an apocalyptic number.

It is an amenable number.

2661432556 is a deficient number, since it is larger than the sum of its proper divisors (1996773612).

2661432556 is a wasteful number, since it uses less digits than its factorization.

2661432556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99888 (or 99886 counting only the distinct ones).

The product of its digits is 259200, while the sum is 40.

The square root of 2661432556 is about 51589.0739982799. The cubic root of 2661432556 is about 1385.8146720406.

The spelling of 2661432556 in words is "two billion, six hundred sixty-one million, four hundred thirty-two thousand, five hundred fifty-six".