394557642163291 has 4 divisors (see below), whose sum is σ = 398990874097800. Its totient is φ = 390124410228784.

The previous prime is 394557642163271. The next prime is 394557642163313. The reversal of 394557642163291 is 192361246755493.

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 394557642163291 - 2³⁵ = 394523282424923 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394557642163231) 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, 2216615967121 + ... + 2216615967298.

It is an arithmetic number, because the mean of its divisors is an integer number (99747718524450).

Almost surely, 2^{394557642163291} is an apocalyptic number.

394557642163291 is a deficient number, since it is larger than the sum of its proper divisors (4433231934509).

394557642163291 is an equidigital number, since it uses as much as digits as its factorization.

394557642163291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4433231934508.

The product of its digits is 293932800, while the sum is 67.

The spelling of 394557642163291 in words is "three hundred ninety-four trillion, five hundred fifty-seven billion, six hundred forty-two million, one hundred sixty-three thousand, two hundred ninety-one".