18474470549 has 2 divisors, whose sum is σ = 18474470550. Its totient is φ = 18474470548.

The previous prime is 18474470543. The next prime is 18474470587. The reversal of 18474470549 is 94507447481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14073076900 + 4401393649 = 118630^2 + 66343^2 .

It is a cyclic number.

It is not a de Polignac number, because 18474470549 - 2⁴ = 18474470533 is a prime.

It is a super-2 number, since 2×18474470549² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18474470549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18474470543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9237235274 + 9237235275.

It is an arithmetic number, because the mean of its divisors is an integer number (9237235275).

Almost surely, 2^18474470549 is an apocalyptic number.

It is an amenable number.

18474470549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18474470549 is an equidigital number, since it uses as much as digits as its factorization.

18474470549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 18474470549 in words is "eighteen billion, four hundred seventy-four million, four hundred seventy thousand, five hundred forty-nine".