18494434261 has 4 divisors (see below), whose sum is σ = 18529796992. Its totient is φ = 18459071532.

The previous prime is 18494434241. The next prime is 18494434307. The reversal of 18494434261 is 16243449481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18494434261 - 2⁵ = 18494434229 is a prime.

It is a super-2 number, since 2×18494434261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18494434241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17680581 + ... + 17681626.

It is an arithmetic number, because the mean of its divisors is an integer number (4632449248).

Almost surely, 2^18494434261 is an apocalyptic number.

It is an amenable number.

18494434261 is a deficient number, since it is larger than the sum of its proper divisors (35362731).

18494434261 is an equidigital number, since it uses as much as digits as its factorization.

18494434261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35362730.

The product of its digits is 663552, while the sum is 46.

The spelling of 18494434261 in words is "eighteen billion, four hundred ninety-four million, four hundred thirty-four thousand, two hundred sixty-one".