197666153 has 6 divisors (see below), whose sum is σ = 198661806. Its totient is φ = 196672512.

The previous prime is 197666111. The next prime is 197666219. The reversal of 197666153 is 351666791.

It can be written as a sum of positive squares in 3 ways, for example, as 157051024 + 40615129 = 12532^2 + 6373^2 .

It is a de Polignac number, because none of the positive numbers 2^k-197666153 is a prime.

It is a Duffinian number.

Its product of digits (204120) is a multiple of the sum of its prime divisors (1134).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197666353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224951 + ... + 225827.

It is an arithmetic number, because the mean of its divisors is an integer number (33110301).

Almost surely, 2^197666153 is an apocalyptic number.

It is an amenable number.

197666153 is a deficient number, since it is larger than the sum of its proper divisors (995653).

197666153 is an frugal number, since it uses more digits than its factorization.

197666153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 1134 counting only the distinct ones).

The product of its digits is 204120, while the sum is 44.

The square root of 197666153 is about 14059.3795382300. The cubic root of 197666153 is about 582.5199050097.

The spelling of 197666153 in words is "one hundred ninety-seven million, six hundred sixty-six thousand, one hundred fifty-three".