6369661 has 4 divisors (see below), whose sum is σ = 6541852. Its totient is φ = 6197472.

The previous prime is 6369653. The next prime is 6369667. The reversal of 6369661 is 1669636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4756761 + 1612900 = 2181^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 6369661 - 2³ = 6369653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 172153 = 6369661 / (6 + 3 + 6 + 9 + 6 + 6 + 1).

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6369661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6369667) 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, 86040 + ... + 86113.

It is an arithmetic number, because the mean of its divisors is an integer number (1635463).

Almost surely, 2^6369661 is an apocalyptic number.

It is an amenable number.

6369661 is a deficient number, since it is larger than the sum of its proper divisors (172191).

6369661 is a wasteful number, since it uses less digits than its factorization.

6369661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172190.

The product of its digits is 34992, while the sum is 37.

The square root of 6369661 is about 2523.8187335861. The cubic root of 6369661 is about 185.3697111134.

The spelling of 6369661 in words is "six million, three hundred sixty-nine thousand, six hundred sixty-one".