6645707 has 4 divisors (see below), whose sum is σ = 6657096. Its totient is φ = 6634320.

The previous prime is 6645697. The next prime is 6645713. The reversal of 6645707 is 7075466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7075466 = 2 ⋅3537733.

It is a cyclic number.

It is not a de Polignac number, because 6645707 - 2¹⁴ = 6629323 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4769 + ... + 6002.

It is an arithmetic number, because the mean of its divisors is an integer number (1664274).

Almost surely, 2^6645707 is an apocalyptic number.

6645707 is a deficient number, since it is larger than the sum of its proper divisors (11389).

6645707 is a wasteful number, since it uses less digits than its factorization.

6645707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11388.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 6645707 is about 2577.9268802664. The cubic root of 6645707 is about 188.0097606974.

The spelling of 6645707 in words is "six million, six hundred forty-five thousand, seven hundred seven".