395366565491 has 4 divisors (see below), whose sum is σ = 395371317984. Its totient is φ = 395361813000.

The previous prime is 395366565449. The next prime is 395366565497. The reversal of 395366565491 is 194565663593.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 395366565491 - 2¹⁸ = 395366303347 is a prime.

It is a super-2 number, since 2×395366565491² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (395366565497) 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, 2249195 + ... + 2418596.

It is an arithmetic number, because the mean of its divisors is an integer number (98842829496).

Almost surely, 2^395366565491 is an apocalyptic number.

395366565491 is a deficient number, since it is larger than the sum of its proper divisors (4752493).

395366565491 is an equidigital number, since it uses as much as digits as its factorization.

395366565491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752492.

The product of its digits is 78732000, while the sum is 62.

The spelling of 395366565491 in words is "three hundred ninety-five billion, three hundred sixty-six million, five hundred sixty-five thousand, four hundred ninety-one".