2661641564 has 6 divisors (see below), whose sum is σ = 4657872744. Its totient is φ = 1330820780.

The previous prime is 2661641527. The next prime is 2661641573. The reversal of 2661641564 is 4651461662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332705192 + ... + 332705199.

It is an arithmetic number, because the mean of its divisors is an integer number (776312124).

Almost surely, 2^2661641564 is an apocalyptic number.

It is an amenable number.

2661641564 is a deficient number, since it is larger than the sum of its proper divisors (1996231180).

2661641564 is a wasteful number, since it uses less digits than its factorization.

2661641564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665410395 (or 665410393 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 2661641564 is about 51591.0996587590. The cubic root of 2661641564 is about 1385.8509480893.

The spelling of 2661641564 in words is "two billion, six hundred sixty-one million, six hundred forty-one thousand, five hundred sixty-four".