18849575720 has 16 divisors (see below), whose sum is σ = 42411545460. Its totient is φ = 7539830272.

The previous prime is 18849575671. The next prime is 18849575729. The reversal of 18849575720 is 2757594881.

It can be written as a sum of positive squares in 2 ways, for example, as 18790378084 + 59197636 = 137078^2 + 7694^2 .

It is not an unprimeable number, because it can be changed into a prime (18849575729) 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, 235619657 + ... + 235619736.

Almost surely, 2^18849575720 is an apocalyptic number.

18849575720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18849575720 is an abundant number, since it is smaller than the sum of its proper divisors (23561969740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18849575720 is a wasteful number, since it uses less digits than its factorization.

18849575720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471239404 (or 471239400 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 18849575720 in words is "eighteen billion, eight hundred forty-nine million, five hundred seventy-five thousand, seven hundred twenty".