664366641 has 8 divisors (see below), whose sum is σ = 906422880. Its totient is φ = 432610752.

The previous prime is 664366603. The next prime is 664366669. The reversal of 664366641 is 146663466.

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

It is not a de Polignac number, because 664366641 - 2²⁶ = 597257777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664366593 and 664366602.

It is not an unprimeable number, because it can be changed into a prime (664366691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2574936 + ... + 2575193.

It is an arithmetic number, because the mean of its divisors is an integer number (113302860).

Almost surely, 2^664366641 is an apocalyptic number.

It is an amenable number.

664366641 is a deficient number, since it is larger than the sum of its proper divisors (242056239).

664366641 is a wasteful number, since it uses less digits than its factorization.

664366641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150175.

The product of its digits is 373248, while the sum is 42.

The square root of 664366641 is about 25775.3106867793. The cubic root of 664366641 is about 872.5746784354.

The spelling of 664366641 in words is "six hundred sixty-four million, three hundred sixty-six thousand, six hundred forty-one".