18917479025 has 6 divisors (see below), whose sum is σ = 23457674022. Its totient is φ = 15133983200.

The previous prime is 18917479013. The next prime is 18917479037. The reversal of 18917479025 is 52097471981.

It is an interprime number because it is at equal distance from previous prime (18917479013) and next prime (18917479037).

It can be written as a sum of positive squares in 3 ways, for example, as 1533583921 + 17383895104 = 39161^2 + 131848^2 .

It is not a de Polignac number, because 18917479025 - 2¹² = 18917474929 is a prime.

It is a super-2 number, since 2×18917479025² (a number of 21 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 378349556 + ... + 378349605.

It is an arithmetic number, because the mean of its divisors is an integer number (3909612337).

Almost surely, 2^18917479025 is an apocalyptic number.

It is an amenable number.

18917479025 is a deficient number, since it is larger than the sum of its proper divisors (4540194997).

18917479025 is an equidigital number, since it uses as much as digits as its factorization.

18917479025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756699171 (or 756699166 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 18917479025 in words is "eighteen billion, nine hundred seventeen million, four hundred seventy-nine thousand, twenty-five".