2665425561 has 8 divisors (see below), whose sum is σ = 3612161664. Its totient is φ = 1747819920.

The previous prime is 2665425527. The next prime is 2665425589. The reversal of 2665425561 is 1655245662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2665425561 - 2³¹ = 517941913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2665423561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7282401 + ... + 7282766.

It is an arithmetic number, because the mean of its divisors is an integer number (451520208).

Almost surely, 2^2665425561 is an apocalyptic number.

It is an amenable number.

2665425561 is a deficient number, since it is larger than the sum of its proper divisors (946736103).

2665425561 is a wasteful number, since it uses less digits than its factorization.

2665425561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14565231.

The product of its digits is 432000, while the sum is 42.

The square root of 2665425561 is about 51627.7595969455. The cubic root of 2665425561 is about 1386.5073816655.

The spelling of 2665425561 in words is "two billion, six hundred sixty-five million, four hundred twenty-five thousand, five hundred sixty-one".