664016247 has 6 divisors (see below), whose sum is σ = 959134592. Its totient is φ = 442677492.

The previous prime is 664016239. The next prime is 664016257. The reversal of 664016247 is 742610466.

664016247 is a `hidden beast` number, since 6 + 6 + 401 + 6 + 247 = 666.

It is not a de Polignac number, because 664016247 - 2³ = 664016239 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 (664016257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36889783 + ... + 36889800.

Almost surely, 2^664016247 is an apocalyptic number.

664016247 is a deficient number, since it is larger than the sum of its proper divisors (295118345).

664016247 is a wasteful number, since it uses less digits than its factorization.

664016247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73779589 (or 73779586 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 664016247 is about 25768.5127044616. The cubic root of 664016247 is about 872.4212497512.

The spelling of 664016247 in words is "six hundred sixty-four million, sixteen thousand, two hundred forty-seven".