18440536607 has 4 divisors (see below), whose sum is σ = 18441560376. Its totient is φ = 18439512840.

The previous prime is 18440536601. The next prime is 18440536637. The reversal of 18440536607 is 70663504481.

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

It is a cyclic number.

It is not a de Polignac number, because 18440536607 - 2¹² = 18440532511 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 (18440536601) 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, 484373 + ... + 521054.

It is an arithmetic number, because the mean of its divisors is an integer number (4610390094).

Almost surely, 2^18440536607 is an apocalyptic number.

18440536607 is a deficient number, since it is larger than the sum of its proper divisors (1023769).

18440536607 is a wasteful number, since it uses less digits than its factorization.

18440536607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023768.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 18440536607 in words is "eighteen billion, four hundred forty million, five hundred thirty-six thousand, six hundred seven".