18879639425 has 48 divisors (see below), whose sum is σ = 25505443440. Its totient is φ = 13815290880.

The previous prime is 18879639413. The next prime is 18879639431. The reversal of 18879639425 is 52493697881.

It can be written as a sum of positive squares in 24 ways, for example, as 1658851441 + 17220787984 = 40729^2 + 131228^2 .

It is not a de Polignac number, because 18879639425 - 2¹⁸ = 18879377281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21527087 + ... + 21527963.

It is an arithmetic number, because the mean of its divisors is an integer number (531363405).

Almost surely, 2^18879639425 is an apocalyptic number.

It is an amenable number.

18879639425 is a deficient number, since it is larger than the sum of its proper divisors (6625804015).

18879639425 is an frugal number, since it uses more digits than its factorization.

18879639425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 936 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 62.

The spelling of 18879639425 in words is "eighteen billion, eight hundred seventy-nine million, six hundred thirty-nine thousand, four hundred twenty-five".