18394649297 has 2 divisors, whose sum is σ = 18394649298. Its totient is φ = 18394649296.

The previous prime is 18394649293. The next prime is 18394649333. The reversal of 18394649297 is 79294649381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18074382481 + 320266816 = 134441^2 + 17896^2 .

It is a cyclic number.

It is not a de Polignac number, because 18394649297 - 2² = 18394649293 is a prime.

It is not a weakly prime, because it can be changed into another prime (18394649293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9197324648 + 9197324649.

It is an arithmetic number, because the mean of its divisors is an integer number (9197324649).

Almost surely, 2^18394649297 is an apocalyptic number.

It is an amenable number.

18394649297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18394649297 is an equidigital number, since it uses as much as digits as its factorization.

18394649297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 62.

The spelling of 18394649297 in words is "eighteen billion, three hundred ninety-four million, six hundred forty-nine thousand, two hundred ninety-seven".