664701969 has 8 divisors (see below), whose sum is σ = 914858752. Its totient is φ = 428839920.

The previous prime is 664701967. The next prime is 664702021. The reversal of 664701969 is 969107466.

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

It is not a de Polignac number, because 664701969 - 2¹ = 664701967 is a prime.

It is a super-2 number, since 2×664701969² = 883657415184953922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664701967) 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, 3573574 + ... + 3573759.

It is an arithmetic number, because the mean of its divisors is an integer number (114357344).

Almost surely, 2^664701969 is an apocalyptic number.

It is an amenable number.

664701969 is a deficient number, since it is larger than the sum of its proper divisors (250156783).

664701969 is a wasteful number, since it uses less digits than its factorization.

664701969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147367.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 664701969 is about 25781.8146956338. The cubic root of 664701969 is about 872.7214595898.

The spelling of 664701969 in words is "six hundred sixty-four million, seven hundred one thousand, nine hundred sixty-nine".