18534951939 has 16 divisors (see below), whose sum is σ = 29007081728. Its totient is φ = 10305146592.

The previous prime is 18534951907. The next prime is 18534951961. The reversal of 18534951939 is 93915943581.

It is not a de Polignac number, because 18534951939 - 2⁵ = 18534951907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18534951989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11926477 + ... + 11928030.

It is an arithmetic number, because the mean of its divisors is an integer number (1812942608).

Almost surely, 2^18534951939 is an apocalyptic number.

18534951939 is a deficient number, since it is larger than the sum of its proper divisors (10472129789).

18534951939 is a wasteful number, since it uses less digits than its factorization.

18534951939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23854554.

The product of its digits is 5248800, while the sum is 57.

The spelling of 18534951939 in words is "eighteen billion, five hundred thirty-four million, nine hundred fifty-one thousand, nine hundred thirty-nine".