491375666573195 has 16 divisors (see below), whose sum is σ = 591023767384800. Its totient is φ = 392185398528000.

The previous prime is 491375666573179. The next prime is 491375666573227. The reversal of 491375666573195 is 591375666573194.

It is not a de Polignac number, because 491375666573195 - 2⁴ = 491375666573179 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11174540 + ... + 33280950.

It is an arithmetic number, because the mean of its divisors is an integer number (36938985461550).

Almost surely, 2^{491375666573195} is an apocalyptic number.

491375666573195 is a deficient number, since it is larger than the sum of its proper divisors (99648100811605).

491375666573195 is a wasteful number, since it uses less digits than its factorization.

491375666573195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22116766.

The product of its digits is 3857868000, while the sum is 77.

Subtracting 491375666573195 from its reverse (591375666573194), we obtain a palindrome (99999999999999).

The spelling of 491375666573195 in words is "four hundred ninety-one trillion, three hundred seventy-five billion, six hundred sixty-six million, five hundred seventy-three thousand, one hundred ninety-five".