1639491648639 has 32 divisors (see below), whose sum is σ = 2456637410304. Its totient is φ = 964996327680.

The previous prime is 1639491648581. The next prime is 1639491648659. The reversal of 1639491648639 is 9368461949361.

It is not a de Polignac number, because 1639491648639 - 2⁷ = 1639491648511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639491648659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19612459 + ... + 19695875.

It is an arithmetic number, because the mean of its divisors is an integer number (76769919072).

Almost surely, 2^{1639491648639} is an apocalyptic number.

1639491648639 is a deficient number, since it is larger than the sum of its proper divisors (817145761665).

1639491648639 is a wasteful number, since it uses less digits than its factorization.

1639491648639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105367.

The product of its digits is 181398528, while the sum is 69.

The spelling of 1639491648639 in words is "one trillion, six hundred thirty-nine billion, four hundred ninety-one million, six hundred forty-eight thousand, six hundred thirty-nine".