646875141578647 has 8 divisors (see below), whose sum is σ = 684928243781712. Its totient is φ = 608822219740800.

The previous prime is 646875141578587. The next prime is 646875141578693. The reversal of 646875141578647 is 746875141578646.

646875141578647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646875141578647 - 2²⁷ = 646875007360919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646875141578047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37672504 + ... + 52086157.

It is an arithmetic number, because the mean of its divisors is an integer number (85616030472714).

Almost surely, 2^{646875141578647} is an apocalyptic number.

646875141578647 is a deficient number, since it is larger than the sum of its proper divisors (38053102203065).

646875141578647 is a wasteful number, since it uses less digits than its factorization.

646875141578647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90182609.

The product of its digits is 7586611200, while the sum is 79.

Subtracting 646875141578647 from its reverse (746875141578646), we obtain a palindrome (99999999999999).

The spelling of 646875141578647 in words is "six hundred forty-six trillion, eight hundred seventy-five billion, one hundred forty-one million, five hundred seventy-eight thousand, six hundred forty-seven".