664729807 has 16 divisors (see below), whose sum is σ = 786030592. Its totient is φ = 550100160.

The previous prime is 664729787. The next prime is 664729817. The reversal of 664729807 is 708927466.

It is a cyclic number.

It is not a de Polignac number, because 664729807 - 2¹⁹ = 664205519 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 (664729817) 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, 95818 + ... + 102520.

It is an arithmetic number, because the mean of its divisors is an integer number (49126912).

Almost surely, 2^664729807 is an apocalyptic number.

664729807 is a deficient number, since it is larger than the sum of its proper divisors (121300785).

664729807 is a wasteful number, since it uses less digits than its factorization.

664729807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 664729807 is about 25782.3545666411. The cubic root of 664729807 is about 872.7336427345.

The spelling of 664729807 in words is "six hundred sixty-four million, seven hundred twenty-nine thousand, eight hundred seven".