2661544625 has 8 divisors (see below), whose sum is σ = 3321607848. Its totient is φ = 2129235600.

The previous prime is 2661544607. The next prime is 2661544637. The reversal of 2661544625 is 5264451662.

It can be written as a sum of positive squares in 4 ways, for example, as 5997601 + 2655547024 = 2449^2 + 51532^2 .

It is not a de Polignac number, because 2661544625 - 2²⁰ = 2660496049 is a prime.

It is a Duffinian number.

It is a Curzon 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, 10646054 + ... + 10646303.

It is an arithmetic number, because the mean of its divisors is an integer number (415200981).

Almost surely, 2^2661544625 is an apocalyptic number.

2661544625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2661544625 is a deficient number, since it is larger than the sum of its proper divisors (660063223).

2661544625 is an equidigital number, since it uses as much as digits as its factorization.

2661544625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292372 (or 21292362 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 2661544625 is about 51590.1601567586. The cubic root of 2661544625 is about 1385.8341233049.

The spelling of 2661544625 in words is "two billion, six hundred sixty-one million, five hundred forty-four thousand, six hundred twenty-five".