18695379425 has 12 divisors (see below), whose sum is σ = 23808819516. Its totient is φ = 14552078400.

The previous prime is 18695379401. The next prime is 18695379431. The reversal of 18695379425 is 52497359681.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3007315921 + 15688063504 = 54839^2 + 125252^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18695379425 is a prime.

It is a Duffinian 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 in 11 ways as a sum of consecutive naturals, for example, 10104686 + ... + 10106535.

It is an arithmetic number, because the mean of its divisors is an integer number (1984068293).

Almost surely, 2^18695379425 is an apocalyptic number.

It is an amenable number.

18695379425 is a deficient number, since it is larger than the sum of its proper divisors (5113440091).

18695379425 is a wasteful number, since it uses less digits than its factorization.

18695379425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20211268 (or 20211263 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 59.

The spelling of 18695379425 in words is "eighteen billion, six hundred ninety-five million, three hundred seventy-nine thousand, four hundred twenty-five".