397116790561 has 4 divisors (see below), whose sum is σ = 397121728900. Its totient is φ = 397111852224.

The previous prime is 397116790531. The next prime is 397116790573. The reversal of 397116790561 is 165097611793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 195364000000 + 201752790561 = 442000^2 + 449169^2 .

It is a cyclic number.

It is not a de Polignac number, because 397116790561 - 2²⁹ = 396579919649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397116790501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2346516 + ... + 2510053.

It is an arithmetic number, because the mean of its divisors is an integer number (99280432225).

Almost surely, 2^397116790561 is an apocalyptic number.

It is an amenable number.

397116790561 is a deficient number, since it is larger than the sum of its proper divisors (4938339).

397116790561 is an equidigital number, since it uses as much as digits as its factorization.

397116790561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938338.

The product of its (nonzero) digits is 2143260, while the sum is 55.

The spelling of 397116790561 in words is "three hundred ninety-seven billion, one hundred sixteen million, seven hundred ninety thousand, five hundred sixty-one".