2545564891 has 2 divisors, whose sum is σ = 2545564892. Its totient is φ = 2545564890.

The previous prime is 2545564877. The next prime is 2545564897. The reversal of 2545564891 is 1984655452.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2545564891 - 2⁹ = 2545564379 is a prime.

It is a super-2 number, since 2×2545564891² = 12959801228583683762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2545564897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272782445 + 1272782446.

It is an arithmetic number, because the mean of its divisors is an integer number (1272782446).

Almost surely, 2^2545564891 is an apocalyptic number.

2545564891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545564891 is an equidigital number, since it uses as much as digits as its factorization.

2545564891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728000, while the sum is 49.

The square root of 2545564891 is about 50453.5914578933. The cubic root of 2545564891 is about 1365.4046917349.

The spelling of 2545564891 in words is "two billion, five hundred forty-five million, five hundred sixty-four thousand, eight hundred ninety-one".