3646623566 has 4 divisors (see below), whose sum is σ = 5469935352. Its totient is φ = 1823311782.

The previous prime is 3646623511. The next prime is 3646623569. The reversal of 3646623566 is 6653266463.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3646623566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3646623569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911655890 + ... + 911655893.

It is an arithmetic number, because the mean of its divisors is an integer number (1367483838).

Almost surely, 2^3646623566 is an apocalyptic number.

3646623566 is a deficient number, since it is larger than the sum of its proper divisors (1823311786).

3646623566 is a wasteful number, since it uses less digits than its factorization.

3646623566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823311785.

The product of its digits is 2799360, while the sum is 47.

The square root of 3646623566 is about 60387.2798360714. The cubic root of 3646623566 is about 1539.2068167586.

The spelling of 3646623566 in words is "three billion, six hundred forty-six million, six hundred twenty-three thousand, five hundred sixty-six".