2665061280 has 144 divisors (see below), whose sum is σ = 10393778304. Its totient is φ = 609154560.

The previous prime is 2665061263. The next prime is 2665061291. The reversal of 2665061280 is 821605662.

2665061280 is a `hidden beast` number, since 2 + 66 + 506 + 12 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 122116 + ... + 142275.

It is an arithmetic number, because the mean of its divisors is an integer number (72179016).

Almost surely, 2^2665061280 is an apocalyptic number.

2665061280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665061280 is an abundant number, since it is smaller than the sum of its proper divisors (7728717024).

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

2665061280 is a wasteful number, since it uses less digits than its factorization.

2665061280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264419 (or 264408 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2665061280 is about 51624.2315197040. The cubic root of 2665061280 is about 1386.4442146033. Note that the first 3 decimals are identical.

The spelling of 2665061280 in words is "two billion, six hundred sixty-five million, sixty-one thousand, two hundred eighty".