664764252386 has 32 divisors (see below), whose sum is σ = 1120859268480. Its totient is φ = 293390659584.

The previous prime is 664764252343. The next prime is 664764252419. The reversal of 664764252386 is 683252467466.

It is a happy number.

It is a super-2 number, since 2×664764252386² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1959266 + ... + 2273378.

It is an arithmetic number, because the mean of its divisors is an integer number (35026852140).

Almost surely, 2^664764252386 is an apocalyptic number.

664764252386 is a deficient number, since it is larger than the sum of its proper divisors (456095016094).

664764252386 is a wasteful number, since it uses less digits than its factorization.

664764252386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317690.

The product of its digits is 69672960, while the sum is 59.

The spelling of 664764252386 in words is "six hundred sixty-four billion, seven hundred sixty-four million, two hundred fifty-two thousand, three hundred eighty-six".