18464396413 has 4 divisors (see below), whose sum is σ = 18488660508. Its totient is φ = 18440132320.

The previous prime is 18464396351. The next prime is 18464396429. The reversal of 18464396413 is 31469346481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8981921529 + 9482474884 = 94773^2 + 97378^2 .

It is a cyclic number.

It is not a de Polignac number, because 18464396413 - 2¹³ = 18464388221 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 (18464396443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12130906 + ... + 12132427.

It is an arithmetic number, because the mean of its divisors is an integer number (4622165127).

Almost surely, 2^18464396413 is an apocalyptic number.

It is an amenable number.

18464396413 is a deficient number, since it is larger than the sum of its proper divisors (24264095).

18464396413 is an equidigital number, since it uses as much as digits as its factorization.

18464396413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24264094.

The product of its digits is 1492992, while the sum is 49.

The spelling of 18464396413 in words is "eighteen billion, four hundred sixty-four million, three hundred ninety-six thousand, four hundred thirteen".