25563530402 has 4 divisors (see below), whose sum is σ = 38345295606. Its totient is φ = 12781765200.

The previous prime is 25563530371. The next prime is 25563530423. The reversal of 25563530402 is 20403536552.

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

It can be written as a sum of positive squares in only one way, i.e., 15984797761 + 9578732641 = 126431^2 + 97871^2 .

It is a super-2 number, since 2×25563530402² (a number of 22 digits) contains 22 as substring.

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, 6390882599 + ... + 6390882602.

Almost surely, 2^25563530402 is an apocalyptic number.

25563530402 is a deficient number, since it is larger than the sum of its proper divisors (12781765204).

25563530402 is a wasteful number, since it uses less digits than its factorization.

25563530402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12781765203.

The product of its (nonzero) digits is 108000, while the sum is 35.

The spelling of 25563530402 in words is "twenty-five billion, five hundred sixty-three million, five hundred thirty thousand, four hundred two".