6660699 has 16 divisors (see below), whose sum is σ = 9182208. Its totient is φ = 4292352.

The previous prime is 6660679. The next prime is 6660707. The reversal of 6660699 is 9960666.

It is not a de Polignac number, because 6660699 - 2¹² = 6656603 is a prime.

It is a super-2 number, since 2×6660699² = 88729822337202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6660699.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660649) 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, 13434 + ... + 13920.

It is an arithmetic number, because the mean of its divisors is an integer number (573888).

Almost surely, 2^6660699 is an apocalyptic number.

6660699 is a deficient number, since it is larger than the sum of its proper divisors (2521509).

6660699 is a wasteful number, since it uses less digits than its factorization.

6660699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 6660699 is about 2580.8330050586. The cubic root of 6660699 is about 188.1510311179.

The spelling of 6660699 in words is "six million, six hundred sixty thousand, six hundred ninety-nine".