18645726532 has 18 divisors (see below), whose sum is σ = 34437781518. Its totient is φ = 8832185568.

The previous prime is 18645726529. The next prime is 18645726559. The reversal of 18645726532 is 23562754681.

It can be written as a sum of positive squares in only one way, i.e., 18589686336 + 56040196 = 136344^2 + 7486^2 .

It is a super-2 number, since 2×18645726532² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6454833 + ... + 6457720.

Almost surely, 2^18645726532 is an apocalyptic number.

It is an amenable number.

18645726532 is a deficient number, since it is larger than the sum of its proper divisors (15792054986).

18645726532 is a wasteful number, since it uses less digits than its factorization.

18645726532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12912595 (or 12912574 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 49.

The spelling of 18645726532 in words is "eighteen billion, six hundred forty-five million, seven hundred twenty-six thousand, five hundred thirty-two".