2661335980 has 24 divisors (see below), whose sum is σ = 5831798112. Its totient is φ = 1018250112.

The previous prime is 2661335959. The next prime is 2661335981. The reversal of 2661335980 is 895331662.

It is not an unprimeable number, because it can be changed into a prime (2661335981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2892297 + ... + 2893216.

It is an arithmetic number, because the mean of its divisors is an integer number (242991588).

Almost surely, 2^2661335980 is an apocalyptic number.

2661335980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661335980 is an abundant number, since it is smaller than the sum of its proper divisors (3170462132).

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

2661335980 is a wasteful number, since it uses less digits than its factorization.

2661335980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5785545 (or 5785543 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 2661335980 is about 51588.1379776398. The cubic root of 2661335980 is about 1385.7979093819.

The spelling of 2661335980 in words is "two billion, six hundred sixty-one million, three hundred thirty-five thousand, nine hundred eighty".