3645554566 has 4 divisors (see below), whose sum is σ = 5468331852. Its totient is φ = 1822777282.

The previous prime is 3645554557. The next prime is 3645554573. The reversal of 3645554566 is 6654555463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6654555463 = 17 ⋅391444439.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 911388640 + ... + 911388643.

It is an arithmetic number, because the mean of its divisors is an integer number (1367082963).

Almost surely, 2^3645554566 is an apocalyptic number.

3645554566 is a deficient number, since it is larger than the sum of its proper divisors (1822777286).

3645554566 is a wasteful number, since it uses less digits than its factorization.

3645554566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822777285.

The product of its digits is 6480000, while the sum is 49.

The square root of 3645554566 is about 60378.4279854983. The cubic root of 3645554566 is about 1539.0563969829.

The spelling of 3645554566 in words is "three billion, six hundred forty-five million, five hundred fifty-four thousand, five hundred sixty-six".