18765428943 has 16 divisors (see below), whose sum is σ = 25534361216. Its totient is φ = 12255455520.

The previous prime is 18765428887. The next prime is 18765428977. The reversal of 18765428943 is 34982456781.

It is a happy number.

It is not a de Polignac number, because 18765428943 - 2²⁰ = 18764380367 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 (18765428243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221521 + ... + 294282.

It is an arithmetic number, because the mean of its divisors is an integer number (1595897576).

Almost surely, 2^18765428943 is an apocalyptic number.

18765428943 is a deficient number, since it is larger than the sum of its proper divisors (6768932273).

18765428943 is a wasteful number, since it uses less digits than its factorization.

18765428943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516054.

The product of its digits is 11612160, while the sum is 57.

The spelling of 18765428943 in words is "eighteen billion, seven hundred sixty-five million, four hundred twenty-eight thousand, nine hundred forty-three".