366644401661 has 8 divisors (see below), whose sum is σ = 376955617080. Its totient is φ = 356354339328.

The previous prime is 366644401639. The next prime is 366644401667. The reversal of 366644401661 is 166104446663.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23928996100 + 342715405561 = 154690^2 + 585419^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-366644401661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366644401667) 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, 5253116 + ... + 5322453.

It is an arithmetic number, because the mean of its divisors is an integer number (47119452135).

Almost surely, 2^366644401661 is an apocalyptic number.

It is an amenable number.

366644401661 is a deficient number, since it is larger than the sum of its proper divisors (10311215419).

366644401661 is a wasteful number, since it uses less digits than its factorization.

366644401661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576543.

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 366644401661 in words is "three hundred sixty-six billion, six hundred forty-four million, four hundred one thousand, six hundred sixty-one".