145631666 has 8 divisors (see below), whose sum is σ = 218506140. Its totient is φ = 72796288.

The previous prime is 145631663. The next prime is 145631683. The reversal of 145631666 is 666136541.

It can be written as a sum of positive squares in 2 ways, for example, as 142301041 + 3330625 = 11929^2 + 1825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (145631663) 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 3 ways as a sum of consecutive naturals, for example, 2750 + ... + 17286.

Almost surely, 2^145631666 is an apocalyptic number.

145631666 is a deficient number, since it is larger than the sum of its proper divisors (72874474).

145631666 is a wasteful number, since it uses less digits than its factorization.

145631666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19548.

The product of its digits is 77760, while the sum is 38.

The square root of 145631666 is about 12067.7945789610. The cubic root of 145631666 is about 526.1205586594.

The spelling of 145631666 in words is "one hundred forty-five million, six hundred thirty-one thousand, six hundred sixty-six".