671894217639 has 12 divisors (see below), whose sum is σ = 970610674800. Its totient is φ = 447884799264.

The previous prime is 671894217601. The next prime is 671894217647. The reversal of 671894217639 is 936712498176.

671894217639 is a `hidden beast` number, since 6 + 71 + 89 + 421 + 7 + 63 + 9 = 666.

It is not a de Polignac number, because 671894217639 - 2⁸ = 671894217383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671894217139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3627894 + ... + 3808595.

It is an arithmetic number, because the mean of its divisors is an integer number (80884222900).

Almost surely, 2^671894217639 is an apocalyptic number.

671894217639 is a deficient number, since it is larger than the sum of its proper divisors (298716457161).

671894217639 is a wasteful number, since it uses less digits than its factorization.

671894217639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7446534 (or 7446531 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 671894217639 in words is "six hundred seventy-one billion, eight hundred ninety-four million, two hundred seventeen thousand, six hundred thirty-nine".