1638572063 has 2 divisors, whose sum is σ = 1638572064. Its totient is φ = 1638572062.

The previous prime is 1638572051. The next prime is 1638572083. The reversal of 1638572063 is 3602758361.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1638572063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1638572063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1638572083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819286031 + 819286032.

It is an arithmetic number, because the mean of its divisors is an integer number (819286032).

Almost surely, 2^1638572063 is an apocalyptic number.

1638572063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638572063 is an equidigital number, since it uses as much as digits as its factorization.

1638572063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1638572063 is about 40479.2794278752. The cubic root of 1638572063 is about 1178.9313467084.

The spelling of 1638572063 in words is "one billion, six hundred thirty-eight million, five hundred seventy-two thousand, sixty-three".