664420783 has 8 divisors (see below), whose sum is σ = 715762208. Its totient is φ = 613112544.

The previous prime is 664420721. The next prime is 664420789. The reversal of 664420783 is 387024466.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664420783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664420789) 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, 46966 + ... + 59452.

It is an arithmetic number, because the mean of its divisors is an integer number (89470276).

Almost surely, 2^664420783 is an apocalyptic number.

664420783 is a deficient number, since it is larger than the sum of its proper divisors (51341425).

664420783 is a wasteful number, since it uses less digits than its factorization.

664420783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16593.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 664420783 is about 25776.3609340031. The cubic root of 664420783 is about 872.5983810378.

The spelling of 664420783 in words is "six hundred sixty-four million, four hundred twenty thousand, seven hundred eighty-three".