18495649547 has 2 divisors, whose sum is σ = 18495649548. Its totient is φ = 18495649546.

The previous prime is 18495649531. The next prime is 18495649583. The reversal of 18495649547 is 74594659481.

It is a weak prime.

It is an emirp because it is prime and its reverse (74594659481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18495649547 - 2⁴ = 18495649531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18495649547.

It is not a weakly prime, because it can be changed into another prime (18495648547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9247824773 + 9247824774.

It is an arithmetic number, because the mean of its divisors is an integer number (9247824774).

Almost surely, 2^18495649547 is an apocalyptic number.

18495649547 is a deficient number, since it is larger than the sum of its proper divisors (1).

18495649547 is an equidigital number, since it uses as much as digits as its factorization.

18495649547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43545600, while the sum is 62.

The spelling of 18495649547 in words is "eighteen billion, four hundred ninety-five million, six hundred forty-nine thousand, five hundred forty-seven".