2554220561 has 4 divisors (see below), whose sum is σ = 2554791792. Its totient is φ = 2553649332.

The previous prime is 2554220531. The next prime is 2554220569. The reversal of 2554220561 is 1650224552.

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 2554220561 - 2²² = 2550026257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2554220569) 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, 278855 + ... + 287868.

It is an arithmetic number, because the mean of its divisors is an integer number (638697948).

Almost surely, 2^2554220561 is an apocalyptic number.

It is an amenable number.

2554220561 is a deficient number, since it is larger than the sum of its proper divisors (571231).

2554220561 is an equidigital number, since it uses as much as digits as its factorization.

2554220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571230.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 2554220561 is about 50539.2971953509. The cubic root of 2554220561 is about 1366.9505335854.

The spelling of 2554220561 in words is "two billion, five hundred fifty-four million, two hundred twenty thousand, five hundred sixty-one".