666387607 has 16 divisors (see below), whose sum is σ = 741916800. Its totient is φ = 595607040.

The previous prime is 666387593. The next prime is 666387643. The reversal of 666387607 is 706783666.

666387607 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666387607 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 (666387677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18994 + ... + 41152.

It is an arithmetic number, because the mean of its divisors is an integer number (46369800).

Almost surely, 2^666387607 is an apocalyptic number.

666387607 is a deficient number, since it is larger than the sum of its proper divisors (75529193).

666387607 is a wasteful number, since it uses less digits than its factorization.

666387607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22266.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The square root of 666387607 is about 25814.4844418787. The cubic root of 666387607 is about 873.4585571883.

The spelling of 666387607 in words is "six hundred sixty-six million, three hundred eighty-seven thousand, six hundred seven".