397694165993 has 4 divisors (see below), whose sum is σ = 402728269440. Its totient is φ = 392660062548.

The previous prime is 397694165989. The next prime is 397694166061. The reversal of 397694165993 is 399561496793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397694165993 - 2² = 397694165989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397694165933) 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, 2517051605 + ... + 2517051762.

It is an arithmetic number, because the mean of its divisors is an integer number (100682067360).

Almost surely, 2^397694165993 is an apocalyptic number.

It is an amenable number.

397694165993 is a deficient number, since it is larger than the sum of its proper divisors (5034103447).

397694165993 is an equidigital number, since it uses as much as digits as its factorization.

397694165993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034103446.

The product of its digits is 297606960, while the sum is 71.

The spelling of 397694165993 in words is "three hundred ninety-seven billion, six hundred ninety-four million, one hundred sixty-five thousand, nine hundred ninety-three".