18644347745 has 32 divisors (see below), whose sum is σ = 23781406464. Its totient is φ = 14001926400.

The previous prime is 18644347741. The next prime is 18644347753. The reversal of 18644347745 is 54774344681.

It is not a de Polignac number, because 18644347745 - 2² = 18644347741 is a prime.

It is a super-2 number, since 2×18644347745² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18644347741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3441659 + ... + 3447071.

It is an arithmetic number, because the mean of its divisors is an integer number (743168952).

Almost surely, 2^18644347745 is an apocalyptic number.

It is an amenable number.

18644347745 is a deficient number, since it is larger than the sum of its proper divisors (5137058719).

18644347745 is a wasteful number, since it uses less digits than its factorization.

18644347745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5993.

The product of its digits is 9031680, while the sum is 53.

The spelling of 18644347745 in words is "eighteen billion, six hundred forty-four million, three hundred forty-seven thousand, seven hundred forty-five".