665123146 has 4 divisors (see below), whose sum is σ = 997684722. Its totient is φ = 332561572.

The previous prime is 665123141. The next prime is 665123171. The reversal of 665123146 is 641321566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 665072521 + 50625 = 25789^2 + 225^2 .

It is not an unprimeable number, because it can be changed into a prime (665123141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166280785 + ... + 166280788.

Almost surely, 2^665123146 is an apocalyptic number.

665123146 is a deficient number, since it is larger than the sum of its proper divisors (332561576).

665123146 is a wasteful number, since it uses less digits than its factorization.

665123146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332561575.

The product of its digits is 25920, while the sum is 34.

The square root of 665123146 is about 25789.9815044525. The cubic root of 665123146 is about 872.9057489986.

The spelling of 665123146 in words is "six hundred sixty-five million, one hundred twenty-three thousand, one hundred forty-six".