151668197 has 4 divisors (see below), whose sum is σ = 152028876. Its totient is φ = 151307520.

The previous prime is 151668163. The next prime is 151668199. The reversal of 151668197 is 791866151.

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 63138916 + 88529281 = 7946^2 + 9409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151668197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151668199) 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, 179708 + ... + 180549.

It is an arithmetic number, because the mean of its divisors is an integer number (38007219).

Almost surely, 2^151668197 is an apocalyptic number.

It is an amenable number.

151668197 is a deficient number, since it is larger than the sum of its proper divisors (360679).

151668197 is an equidigital number, since it uses as much as digits as its factorization.

151668197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360678.

The product of its digits is 90720, while the sum is 44.

The square root of 151668197 is about 12315.3642658267. The cubic root of 151668197 is about 533.2917206682.

The spelling of 151668197 in words is "one hundred fifty-one million, six hundred sixty-eight thousand, one hundred ninety-seven".