2564543477 has 2 divisors, whose sum is σ = 2564543478. Its totient is φ = 2564543476.

The previous prime is 2564543431. The next prime is 2564543497. The reversal of 2564543477 is 7743454652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2556920356 + 7623121 = 50566^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564543477 - 2⁶ = 2564543413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2564543497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282271738 + 1282271739.

It is an arithmetic number, because the mean of its divisors is an integer number (1282271739).

Almost surely, 2^2564543477 is an apocalyptic number.

It is an amenable number.

2564543477 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564543477 is an equidigital number, since it uses as much as digits as its factorization.

2564543477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 47.

The square root of 2564543477 is about 50641.3218330643. The cubic root of 2564543477 is about 1368.7895744915.

The spelling of 2564543477 in words is "two billion, five hundred sixty-four million, five hundred forty-three thousand, four hundred seventy-seven".