6399646371495 has 80 divisors (see below), whose sum is σ = 12419101804032. Its totient is φ = 3134099381760.

The previous prime is 6399646371439. The next prime is 6399646371551. The reversal of 6399646371495 is 5941736469936.

6399646371495 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 6 + 4 + 63 + 71 + 495 = 666.

It is an interprime number because it is at equal distance from previous prime (6399646371439) and next prime (6399646371551).

It is not a de Polignac number, because 6399646371495 - 2¹⁰ = 6399646370471 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2176342 + ... + 4187571.

Almost surely, 2^{6399646371495} is an apocalyptic number.

6399646371495 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6399646371495 is a deficient number, since it is larger than the sum of its proper divisors (6019455432537).

6399646371495 is a wasteful number, since it uses less digits than its factorization.

6399646371495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364134 (or 6364125 counting only the distinct ones).

The product of its digits is 793618560, while the sum is 72.

The spelling of 6399646371495 in words is "six trillion, three hundred ninety-nine billion, six hundred forty-six million, three hundred seventy-one thousand, four hundred ninety-five".