2655642561 has 16 divisors (see below), whose sum is σ = 4159888320. Its totient is φ = 1485673920.

The previous prime is 2655642449. The next prime is 2655642601. The reversal of 2655642561 is 1652465562.

It is a happy number.

2655642561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2655642561 - 2¹⁷ = 2655511489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2655642061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3094726 + ... + 3095583.

It is an arithmetic number, because the mean of its divisors is an integer number (259993020).

Almost surely, 2^2655642561 is an apocalyptic number.

It is an amenable number.

2655642561 is a deficient number, since it is larger than the sum of its proper divisors (1504245759).

2655642561 is a wasteful number, since it uses less digits than its factorization.

2655642561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6190336.

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

The square root of 2655642561 is about 51532.9269593723. The cubic root of 2655642561 is about 1384.8089873726.

The spelling of 2655642561 in words is "two billion, six hundred fifty-five million, six hundred forty-two thousand, five hundred sixty-one".