664386542 has 8 divisors (see below), whose sum is σ = 996690096. Its totient is φ = 332156512.

The previous prime is 664386523. The next prime is 664386557. The reversal of 664386542 is 245683466.

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

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 664386493 and 664386502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21638 + ... + 42390.

It is an arithmetic number, because the mean of its divisors is an integer number (124586262).

Almost surely, 2^664386542 is an apocalyptic number.

664386542 is a deficient number, since it is larger than the sum of its proper divisors (332303554).

664386542 is a wasteful number, since it uses less digits than its factorization.

664386542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36762.

The product of its digits is 829440, while the sum is 44.

The square root of 664386542 is about 25775.6967316113. The cubic root of 664386542 is about 872.5833909616.

The spelling of 664386542 in words is "six hundred sixty-four million, three hundred eighty-six thousand, five hundred forty-two".