18664680529 has 4 divisors (see below), whose sum is σ = 20361469680. Its totient is φ = 16967891380.

The previous prime is 18664680439. The next prime is 18664680547. The reversal of 18664680529 is 92508646681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18664680529 - 2¹⁵ = 18664647761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18664680529.

It is not an unprimeable number, because it can be changed into a prime (18664680589) 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, 848394559 + ... + 848394580.

It is an arithmetic number, because the mean of its divisors is an integer number (5090367420).

Almost surely, 2^18664680529 is an apocalyptic number.

It is an amenable number.

18664680529 is a deficient number, since it is larger than the sum of its proper divisors (1696789151).

18664680529 is a wasteful number, since it uses less digits than its factorization.

18664680529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696789150.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 18664680529 in words is "eighteen billion, six hundred sixty-four million, six hundred eighty thousand, five hundred twenty-nine".