664067545 has 8 divisors (see below), whose sum is σ = 797045760. Its totient is φ = 531144240.

The previous prime is 664067519. The next prime is 664067557. The reversal of 664067545 is 545760466.

It is a happy number.

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

It is not a de Polignac number, because 664067545 - 2⁵ = 664067513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20766 + ... + 41944.

It is an arithmetic number, because the mean of its divisors is an integer number (99630720).

Almost surely, 2^664067545 is an apocalyptic number.

It is an amenable number.

664067545 is a deficient number, since it is larger than the sum of its proper divisors (132978215).

664067545 is a wasteful number, since it uses less digits than its factorization.

664067545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27455.

The product of its (nonzero) digits is 604800, while the sum is 43.

The square root of 664067545 is about 25769.5080473027. The cubic root of 664067545 is about 872.4437152220.

The spelling of 664067545 in words is "six hundred sixty-four million, sixty-seven thousand, five hundred forty-five".