2564355478 has 4 divisors (see below), whose sum is σ = 3846533220. Its totient is φ = 1282177738.

The previous prime is 2564355419. The next prime is 2564355481. The reversal of 2564355478 is 8745534652.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641088868 + ... + 641088871.

It is an arithmetic number, because the mean of its divisors is an integer number (961633305).

Almost surely, 2^2564355478 is an apocalyptic number.

2564355478 is a deficient number, since it is larger than the sum of its proper divisors (1282177742).

2564355478 is a wasteful number, since it uses less digits than its factorization.

2564355478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282177741.

The product of its digits is 4032000, while the sum is 49.

The square root of 2564355478 is about 50639.4656172436. The cubic root of 2564355478 is about 1368.7561263864.

The spelling of 2564355478 in words is "two billion, five hundred sixty-four million, three hundred fifty-five thousand, four hundred seventy-eight".