2661525553 has 4 divisors (see below), whose sum is σ = 2747381248. Its totient is φ = 2575669860.

The previous prime is 2661525521. The next prime is 2661525571. The reversal of 2661525553 is 3555251662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2661525553 - 2⁵ = 2661525521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661522553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42927801 + ... + 42927862.

It is an arithmetic number, because the mean of its divisors is an integer number (686845312).

Almost surely, 2^2661525553 is an apocalyptic number.

It is an amenable number.

2661525553 is a deficient number, since it is larger than the sum of its proper divisors (85855695).

2661525553 is an equidigital number, since it uses as much as digits as its factorization.

2661525553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85855694.

The product of its digits is 270000, while the sum is 40.

The square root of 2661525553 is about 51589.9753149776. The cubic root of 2661525553 is about 1385.8308131104.

The spelling of 2661525553 in words is "two billion, six hundred sixty-one million, five hundred twenty-five thousand, five hundred fifty-three".