664016639 has 8 divisors (see below), whose sum is σ = 780103632. Its totient is φ = 557216640.

The previous prime is 664016623. The next prime is 664016663. The reversal of 664016639 is 936610466.

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

It is a cyclic number.

It is not a de Polignac number, because 664016639 - 2⁴ = 664016623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664016596 and 664016605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664016239) 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, 2321594 + ... + 2321879.

It is an arithmetic number, because the mean of its divisors is an integer number (97512954).

Almost surely, 2^664016639 is an apocalyptic number.

664016639 is a deficient number, since it is larger than the sum of its proper divisors (116086993).

664016639 is a wasteful number, since it uses less digits than its factorization.

664016639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643497.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 664016639 is about 25768.5203106426. The cubic root of 664016639 is about 872.4214214283.

The spelling of 664016639 in words is "six hundred sixty-four million, sixteen thousand, six hundred thirty-nine".