1638764000623 has 2 divisors, whose sum is σ = 1638764000624. Its totient is φ = 1638764000622.

The previous prime is 1638764000581. The next prime is 1638764000639. The reversal of 1638764000623 is 3260004678361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1638764000623 - 2²⁹ = 1638227129711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638764000683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819382000311 + 819382000312.

It is an arithmetic number, because the mean of its divisors is an integer number (819382000312).

Almost surely, 2^{1638764000623} is an apocalyptic number.

1638764000623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638764000623 is an equidigital number, since it uses as much as digits as its factorization.

1638764000623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 46.

Adding to 1638764000623 its reverse (3260004678361), we get a palindrome (4898768678984).

The spelling of 1638764000623 in words is "one trillion, six hundred thirty-eight billion, seven hundred sixty-four million, six hundred twenty-three", and thus it is an aban number.