2564633542 has 4 divisors (see below), whose sum is σ = 3846950316. Its totient is φ = 1282316770.

The previous prime is 2564633527. The next prime is 2564633543. The reversal of 2564633542 is 2453364652.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2564633495 and 2564633504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564633543) by changing a digit.

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, 641158384 + ... + 641158387.

It is an arithmetic number, because the mean of its divisors is an integer number (961737579).

Almost surely, 2^2564633542 is an apocalyptic number.

2564633542 is a deficient number, since it is larger than the sum of its proper divisors (1282316774).

2564633542 is a wasteful number, since it uses less digits than its factorization.

2564633542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282316773.

The product of its digits is 518400, while the sum is 40.

The square root of 2564633542 is about 50642.2110694231. The cubic root of 2564633542 is about 1368.8055979529.

The spelling of 2564633542 in words is "two billion, five hundred sixty-four million, six hundred thirty-three thousand, five hundred forty-two".