18647560949 has 2 divisors, whose sum is σ = 18647560950. Its totient is φ = 18647560948.

The previous prime is 18647560927. The next prime is 18647560957. The reversal of 18647560949 is 94906574681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10729230724 + 7918330225 = 103582^2 + 88985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18647560949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18647560909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9323780474 + 9323780475.

It is an arithmetic number, because the mean of its divisors is an integer number (9323780475).

Almost surely, 2^18647560949 is an apocalyptic number.

It is an amenable number.

18647560949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18647560949 is an equidigital number, since it uses as much as digits as its factorization.

18647560949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 18647560949 in words is "eighteen billion, six hundred forty-seven million, five hundred sixty thousand, nine hundred forty-nine".