18211287623 has 8 divisors (see below), whose sum is σ = 18332138880. Its totient is φ = 18090649080.

The previous prime is 18211287593. The next prime is 18211287667. The reversal of 18211287623 is 32678211281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18211287623 - 2¹⁸ = 18211025479 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 (18211280623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120488 + ... + 225698.

It is an arithmetic number, because the mean of its divisors is an integer number (2291517360).

Almost surely, 2^18211287623 is an apocalyptic number.

18211287623 is a deficient number, since it is larger than the sum of its proper divisors (120851257).

18211287623 is a wasteful number, since it uses less digits than its factorization.

18211287623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106357.

The product of its digits is 64512, while the sum is 41.

The spelling of 18211287623 in words is "eighteen billion, two hundred eleven million, two hundred eighty-seven thousand, six hundred twenty-three".