18694949205 has 32 divisors (see below), whose sum is σ = 31635555840. Its totient is φ = 9401071680.

The previous prime is 18694949159. The next prime is 18694949213. The reversal of 18694949205 is 50294949681.

It is not a de Polignac number, because 18694949205 - 2¹¹ = 18694947157 is a prime.

It is a super-2 number, since 2×18694949205² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95307 + ... + 215576.

It is an arithmetic number, because the mean of its divisors is an integer number (988611120).

Almost surely, 2^18694949205 is an apocalyptic number.

18694949205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18694949205 is a deficient number, since it is larger than the sum of its proper divisors (12940606635).

18694949205 is a wasteful number, since it uses less digits than its factorization.

18694949205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311121.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 18694949205 in words is "eighteen billion, six hundred ninety-four million, nine hundred forty-nine thousand, two hundred five".