2661656980 has 24 divisors (see below), whose sum is σ = 5590706688. Its totient is φ = 1064429088.

The previous prime is 2661656951. The next prime is 2661656999. The reversal of 2661656980 is 896561662.

It is a happy number.

2661656980 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, 101157 + ... + 124723.

It is an arithmetic number, because the mean of its divisors is an integer number (232946112).

Almost surely, 2^2661656980 is an apocalyptic number.

2661656980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661656980 is an abundant number, since it is smaller than the sum of its proper divisors (2929049708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661656980 is a wasteful number, since it uses less digits than its factorization.

2661656980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29223 (or 29221 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 2661656980 is about 51591.2490641582. The cubic root of 2661656980 is about 1385.8536236608.

The spelling of 2661656980 in words is "two billion, six hundred sixty-one million, six hundred fifty-six thousand, nine hundred eighty".