25645256394 has 32 divisors (see below), whose sum is σ = 53141901120. Its totient is φ = 8240773632.

The previous prime is 25645256393. The next prime is 25645256437. The reversal of 25645256394 is 49365254652.

It is not an unprimeable number, because it can be changed into a prime (25645256393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2727 + ... + 226490.

It is an arithmetic number, because the mean of its divisors is an integer number (1660684410).

Almost surely, 2^25645256394 is an apocalyptic number.

25645256394 is an abundant number, since it is smaller than the sum of its proper divisors (27496644726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25645256394 is a wasteful number, since it uses less digits than its factorization.

25645256394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229894.

The product of its digits is 7776000, while the sum is 51.

The spelling of 25645256394 in words is "twenty-five billion, six hundred forty-five million, two hundred fifty-six thousand, three hundred ninety-four".