2564989551 has 8 divisors (see below), whose sum is σ = 3799984560. Its totient is φ = 1709993016.

The previous prime is 2564989543. The next prime is 2564989571. The reversal of 2564989551 is 1559894652.

2564989551 is a `hidden beast` number, since 2 + 5 + 6 + 4 + 9 + 89 + 551 = 666.

2564989551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2564989551 - 2³ = 2564989543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564989501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47499780 + ... + 47499833.

It is an arithmetic number, because the mean of its divisors is an integer number (474998070).

Almost surely, 2^2564989551 is an apocalyptic number.

2564989551 is a deficient number, since it is larger than the sum of its proper divisors (1234995009).

2564989551 is an equidigital number, since it uses as much as digits as its factorization.

2564989551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94999622 (or 94999616 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The square root of 2564989551 is about 50645.7258907403. The cubic root of 2564989551 is about 1368.8689318311.

The spelling of 2564989551 in words is "two billion, five hundred sixty-four million, nine hundred eighty-nine thousand, five hundred fifty-one".