18616308407 has 4 divisors (see below), whose sum is σ = 18617689560. Its totient is φ = 18614927256.

The previous prime is 18616308299. The next prime is 18616308463. The reversal of 18616308407 is 70480361681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70480361681 = 109847 ⋅641623.

It is a cyclic number.

It is not a de Polignac number, because 18616308407 - 2¹⁸ = 18616046263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18616304407) 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 3 ways as a sum of consecutive naturals, for example, 670157 + ... + 697382.

It is an arithmetic number, because the mean of its divisors is an integer number (4654422390).

Almost surely, 2^18616308407 is an apocalyptic number.

18616308407 is a deficient number, since it is larger than the sum of its proper divisors (1381153).

18616308407 is a wasteful number, since it uses less digits than its factorization.

18616308407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381152.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 18616308407 in words is "eighteen billion, six hundred sixteen million, three hundred eight thousand, four hundred seven".