18409313602 has 4 divisors (see below), whose sum is σ = 27613970406. Its totient is φ = 9204656800.

The previous prime is 18409313563. The next prime is 18409313623. The reversal of 18409313602 is 20631390481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20631390481 = 13 ⋅1587030037.

It can be written as a sum of positive squares in only one way, i.e., 10047857121 + 8361456481 = 100239^2 + 91441^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4602328399 + ... + 4602328402.

Almost surely, 2^18409313602 is an apocalyptic number.

18409313602 is a deficient number, since it is larger than the sum of its proper divisors (9204656804).

18409313602 is an equidigital number, since it uses as much as digits as its factorization.

18409313602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204656803.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 18409313602 in words is "eighteen billion, four hundred nine million, three hundred thirteen thousand, six hundred two".