3664661405 has 4 divisors (see below), whose sum is σ = 4397593692. Its totient is φ = 2931729120.

The previous prime is 3664661383. The next prime is 3664661447. The reversal of 3664661405 is 5041664663.

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 1281854809 + 2382806596 = 35803^2 + 48814^2 .

It is not a de Polignac number, because 3664661405 - 2¹⁴ = 3664645021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366466136 + ... + 366466145.

It is an arithmetic number, because the mean of its divisors is an integer number (1099398423).

Almost surely, 2^3664661405 is an apocalyptic number.

It is an amenable number.

3664661405 is a deficient number, since it is larger than the sum of its proper divisors (732932287).

3664661405 is an equidigital number, since it uses as much as digits as its factorization.

3664661405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732932286.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 3664661405 is about 60536.4469142351. The cubic root of 3664661405 is about 1541.7405132908.

The spelling of 3664661405 in words is "three billion, six hundred sixty-four million, six hundred sixty-one thousand, four hundred five".