664770545 has 8 divisors (see below), whose sum is σ = 799736424. Its totient is φ = 530475264.

The previous prime is 664770539. The next prime is 664770553. The reversal of 664770545 is 545077466.

It can be written as a sum of positive squares in 4 ways, for example, as 75203584 + 589566961 = 8672^2 + 24281^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 664770545 - 2⁸ = 664770289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664770496 and 664770505.

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, 165464 + ... + 169433.

It is an arithmetic number, because the mean of its divisors is an integer number (99967053).

Almost surely, 2^664770545 is an apocalyptic number.

It is an amenable number.

664770545 is a deficient number, since it is larger than the sum of its proper divisors (134965879).

664770545 is a wasteful number, since it uses less digits than its factorization.

664770545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335299.

The product of its (nonzero) digits is 705600, while the sum is 44.

The square root of 664770545 is about 25783.1445909920. The cubic root of 664770545 is about 872.7514708789.

The spelling of 664770545 in words is "six hundred sixty-four million, seven hundred seventy thousand, five hundred forty-five".