197661565 has 8 divisors (see below), whose sum is σ = 237370680. Its totient is φ = 158011392.

The previous prime is 197661559. The next prime is 197661571. The reversal of 197661565 is 565166791.

It is an interprime number because it is at equal distance from previous prime (197661559) and next prime (197661571).

It can be written as a sum of positive squares in 4 ways, for example, as 6084 + 197655481 = 78^2 + 14059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197661565 - 2³ = 197661557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6984 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (29671335).

Almost surely, 2^197661565 is an apocalyptic number.

It is an amenable number.

197661565 is a deficient number, since it is larger than the sum of its proper divisors (39709115).

197661565 is a wasteful number, since it uses less digits than its factorization.

197661565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29471.

The product of its digits is 340200, while the sum is 46.

The square root of 197661565 is about 14059.2163721880. The cubic root of 197661565 is about 582.5153980469.

The spelling of 197661565 in words is "one hundred ninety-seven million, six hundred sixty-one thousand, five hundred sixty-five".