1638698273864 has 16 divisors (see below), whose sum is σ = 3118418358000. Its totient is φ = 807120045072.

The previous prime is 1638698273843. The next prime is 1638698273879. The reversal of 1638698273864 is 4683728968361.

It is a happy number.

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528635914 + ... + 1528636985.

It is an arithmetic number, because the mean of its divisors is an integer number (194901147375).

Almost surely, 2^{1638698273864} is an apocalyptic number.

It is an amenable number.

1638698273864 is a deficient number, since it is larger than the sum of its proper divisors (1479720084136).

1638698273864 is a wasteful number, since it uses less digits than its factorization.

1638698273864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057272972 (or 3057272968 counting only the distinct ones).

The product of its digits is 501645312, while the sum is 71.

The spelling of 1638698273864 in words is "one trillion, six hundred thirty-eight billion, six hundred ninety-eight million, two hundred seventy-three thousand, eight hundred sixty-four".