18697150397 has 2 divisors, whose sum is σ = 18697150398. Its totient is φ = 18697150396.

The previous prime is 18697150379. The next prime is 18697150427. The reversal of 18697150397 is 79305179681.

Together with previous prime (18697150379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18676228921 + 20921476 = 136661^2 + 4574^2 .

It is a cyclic number.

It is not a de Polignac number, because 18697150397 - 2¹⁴ = 18697134013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18697155397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9348575198 + 9348575199.

It is an arithmetic number, because the mean of its divisors is an integer number (9348575199).

Almost surely, 2^18697150397 is an apocalyptic number.

It is an amenable number.

18697150397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18697150397 is an equidigital number, since it uses as much as digits as its factorization.

18697150397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 18697150397 in words is "eighteen billion, six hundred ninety-seven million, one hundred fifty thousand, three hundred ninety-seven".