18813577906 has 8 divisors (see below), whose sum is σ = 28221593580. Its totient is φ = 9406380048.

The previous prime is 18813577883. The next prime is 18813577907. The reversal of 18813577906 is 60977531881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14091826681 + 4721751225 = 118709^2 + 68715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18813577907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143281 + ... + 241156.

Almost surely, 2^18813577906 is an apocalyptic number.

18813577906 is a deficient number, since it is larger than the sum of its proper divisors (9408015674).

18813577906 is a wasteful number, since it uses less digits than its factorization.

18813577906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408908.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 18813577906 in words is "eighteen billion, eight hundred thirteen million, five hundred seventy-seven thousand, nine hundred six".