2661397684 has 24 divisors (see below), whose sum is σ = 5097109248. Its totient is φ = 1205855040.

The previous prime is 2661397663. The next prime is 2661397691. The reversal of 2661397684 is 4867931662.

2661397684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82852 + ... + 110395.

It is an arithmetic number, because the mean of its divisors is an integer number (212379552).

Almost surely, 2^2661397684 is an apocalyptic number.

It is an amenable number.

2661397684 is a deficient number, since it is larger than the sum of its proper divisors (2435711564).

2661397684 is a wasteful number, since it uses less digits than its factorization.

2661397684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193575 (or 193573 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The square root of 2661397684 is about 51588.7360186310. The cubic root of 2661397684 is about 1385.8086193679.

The spelling of 2661397684 in words is "two billion, six hundred sixty-one million, three hundred ninety-seven thousand, six hundred eighty-four".