18940167623 has 16 divisors (see below), whose sum is σ = 20985191136. Its totient is φ = 16986309120.

The previous prime is 18940167607. The next prime is 18940167637. The reversal of 18940167623 is 32676104981.

It is a cyclic number.

It is not a de Polignac number, because 18940167623 - 2⁴ = 18940167607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940167683) 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, 85358 + ... + 212523.

It is an arithmetic number, because the mean of its divisors is an integer number (1311574446).

Almost surely, 2^18940167623 is an apocalyptic number.

18940167623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18940167623 is a deficient number, since it is larger than the sum of its proper divisors (2045023513).

18940167623 is a wasteful number, since it uses less digits than its factorization.

18940167623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298034.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 18940167623 in words is "eighteen billion, nine hundred forty million, one hundred sixty-seven thousand, six hundred twenty-three".