665650151 has 4 divisors (see below), whose sum is σ = 667625712. Its totient is φ = 663674592.

The previous prime is 665650127. The next prime is 665650157. The reversal of 665650151 is 151056566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 151056566 = 2 ⋅75528283.

It is a cyclic number.

It is not a de Polignac number, because 665650151 - 2⁶ = 665650087 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 (665650157) 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, 987275 + ... + 987948.

It is an arithmetic number, because the mean of its divisors is an integer number (166906428).

Almost surely, 2^665650151 is an apocalyptic number.

665650151 is a deficient number, since it is larger than the sum of its proper divisors (1975561).

665650151 is a wasteful number, since it uses less digits than its factorization.

665650151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975560.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 665650151 is about 25800.1967240562. The cubic root of 665650151 is about 873.1362347621.

The spelling of 665650151 in words is "six hundred sixty-five million, six hundred fifty thousand, one hundred fifty-one".