1638677023 has 2 divisors, whose sum is σ = 1638677024. Its totient is φ = 1638677022.

The previous prime is 1638677009. The next prime is 1638677077. The reversal of 1638677023 is 3207768361.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1638677023 is a prime.

It is a super-3 number, since 3×1638677023³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638677003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819338511 + 819338512.

It is an arithmetic number, because the mean of its divisors is an integer number (819338512).

Almost surely, 2^1638677023 is an apocalyptic number.

1638677023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638677023 is an equidigital number, since it uses as much as digits as its factorization.

1638677023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 1638677023 is about 40480.5758728801. The cubic root of 1638677023 is about 1178.9565186238.

The spelling of 1638677023 in words is "one billion, six hundred thirty-eight million, six hundred seventy-seven thousand, twenty-three".