3666556401 has 8 divisors (see below), whose sum is σ = 4890446784. Its totient is φ = 2443518480.

The previous prime is 3666556367. The next prime is 3666556417. The reversal of 3666556401 is 1046556663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3666556401 - 2²⁵ = 3633001969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3666556451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203010 + ... + 220331.

It is an arithmetic number, because the mean of its divisors is an integer number (611305848).

Almost surely, 2^3666556401 is an apocalyptic number.

It is an amenable number.

3666556401 is a deficient number, since it is larger than the sum of its proper divisors (1223890383).

3666556401 is a wasteful number, since it uses less digits than its factorization.

3666556401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426231.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 3666556401 is about 60552.0965863280. The cubic root of 3666556401 is about 1542.0062121138.

The spelling of 3666556401 in words is "three billion, six hundred sixty-six million, five hundred fifty-six thousand, four hundred one".