18345649689 has 48 divisors (see below), whose sum is σ = 28794407040. Its totient is φ = 11522316960.

The previous prime is 18345649639. The next prime is 18345649703. The reversal of 18345649689 is 98694654381.

18345649689 is a `hidden beast` number, since 1 + 8 + 3 + 4 + 564 + 9 + 68 + 9 = 666.

It is not a de Polignac number, because 18345649689 - 2¹¹ = 18345647641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18345649639) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2784379 + ... + 2790959.

It is an arithmetic number, because the mean of its divisors is an integer number (599883480).

Almost surely, 2^18345649689 is an apocalyptic number.

It is an amenable number.

18345649689 is a deficient number, since it is larger than the sum of its proper divisors (10448757351).

18345649689 is an equidigital number, since it uses as much as digits as its factorization.

18345649689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6747 (or 6674 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 63.

The spelling of 18345649689 in words is "eighteen billion, three hundred forty-five million, six hundred forty-nine thousand, six hundred eighty-nine".