18156423077 has 16 divisors (see below), whose sum is σ = 21061383168. Its totient is φ = 15513949440.

The previous prime is 18156423059. The next prime is 18156423107. The reversal of 18156423077 is 77032465181.

It is a cyclic number.

It is not a de Polignac number, because 18156423077 - 2⁶ = 18156423013 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 (18156423577) 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, 970148 + ... + 988685.

It is an arithmetic number, because the mean of its divisors is an integer number (1316336448).

Almost surely, 2^18156423077 is an apocalyptic number.

It is an amenable number.

18156423077 is a deficient number, since it is larger than the sum of its proper divisors (2904960091).

18156423077 is a wasteful number, since it uses less digits than its factorization.

18156423077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958900.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 18156423077 in words is "eighteen billion, one hundred fifty-six million, four hundred twenty-three thousand, seventy-seven".