1638496485427 has 2 divisors, whose sum is σ = 1638496485428. Its totient is φ = 1638496485426.

The previous prime is 1638496485419. The next prime is 1638496485443. The reversal of 1638496485427 is 7245846948361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1638496485427 - 2³ = 1638496485419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638496485127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819248242713 + 819248242714.

It is an arithmetic number, because the mean of its divisors is an integer number (819248242714).

Almost surely, 2^{1638496485427} is an apocalyptic number.

1638496485427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638496485427 is an equidigital number, since it uses as much as digits as its factorization.

1638496485427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 278691840, while the sum is 67.

The spelling of 1638496485427 in words is "one trillion, six hundred thirty-eight billion, four hundred ninety-six million, four hundred eighty-five thousand, four hundred twenty-seven".