6421194636975 has 144 divisors (see below), whose sum is σ = 11721458112000. Its totient is φ = 3359477721600.

The previous prime is 6421194636971. The next prime is 6421194636977. The reversal of 6421194636975 is 5796364911246.

It is a happy number.

6421194636975 is a `hidden beast` number, since 6 + 42 + 1 + 1 + 9 + 463 + 69 + 75 = 666.

It is not a de Polignac number, because 6421194636975 - 2² = 6421194636971 is a prime.

Its product of digits (58786560) is a multiple of the sum of its prime factors (2430).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421194636971) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6852928707 + ... + 6852929643.

Almost surely, 2^{6421194636975} is an apocalyptic number.

6421194636975 is a deficient number, since it is larger than the sum of its proper divisors (5300263475025).

6421194636975 is a wasteful number, since it uses less digits than its factorization.

6421194636975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430 (or 2422 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 6421194636975 in words is "six trillion, four hundred twenty-one billion, one hundred ninety-four million, six hundred thirty-six thousand, nine hundred seventy-five".