145666647 has 32 divisors (see below), whose sum is σ = 247257600. Its totient is φ = 83026944.

The previous prime is 145666639. The next prime is 145666663. The reversal of 145666647 is 746666541.

It is not a de Polignac number, because 145666647 - 2³ = 145666639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145666627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102679 + ... + 104087.

It is an arithmetic number, because the mean of its divisors is an integer number (7726800).

Almost surely, 2^145666647 is an apocalyptic number.

145666647 is a deficient number, since it is larger than the sum of its proper divisors (101590953).

145666647 is a wasteful number, since it uses less digits than its factorization.

145666647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1966 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 145666647 is about 12069.2438454114. The cubic root of 145666647 is about 526.1626803362.

It can be divided in two parts, 14 and 5666647, that added together give a triangular number (5666661 = T₃₃₆₆).

The spelling of 145666647 in words is "one hundred forty-five million, six hundred sixty-six thousand, six hundred forty-seven".