6386669974840 has 16 divisors (see below), whose sum is σ = 14370007443480. Its totient is φ = 2554667989920.

The previous prime is 6386669974807. The next prime is 6386669974847. The reversal of 6386669974840 is 484799666836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6386669974847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79833374646 + ... + 79833374725.

Almost surely, 2^{6386669974840} is an apocalyptic number.

It is an amenable number.

6386669974840 is an abundant number, since it is smaller than the sum of its proper divisors (7983337468640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6386669974840 is a wasteful number, since it uses less digits than its factorization.

6386669974840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159666749382 (or 159666749378 counting only the distinct ones).

The product of its (nonzero) digits is 2257403904, while the sum is 76.

The spelling of 6386669974840 in words is "six trillion, three hundred eighty-six billion, six hundred sixty-nine million, nine hundred seventy-four thousand, eight hundred forty".