151665691 has 2 divisors, whose sum is σ = 151665692. Its totient is φ = 151665690.

The previous prime is 151665673. The next prime is 151665739. The reversal of 151665691 is 196566151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 151665691 - 2⁵ = 151665659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (151665641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75832845 + 75832846.

It is an arithmetic number, because the mean of its divisors is an integer number (75832846).

Almost surely, 2^151665691 is an apocalyptic number.

151665691 is a deficient number, since it is larger than the sum of its proper divisors (1).

151665691 is an equidigital number, since it uses as much as digits as its factorization.

151665691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 151665691 is about 12315.2625225774. The cubic root of 151665691 is about 533.2887834750.

The spelling of 151665691 in words is "one hundred fifty-one million, six hundred sixty-five thousand, six hundred ninety-one".