3661664663801 has 4 divisors (see below), whose sum is σ = 3697214806272. Its totient is φ = 3626114521332.

The previous prime is 3661664663771. The next prime is 3661664663807. The reversal of 3661664663801 is 1083664661663.

3661664663801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3661664663801 - 2¹⁸ = 3661664401657 is a prime.

It is a super-2 number, since 2×3661664663801² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661664663807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17775071081 + ... + 17775071286.

It is an arithmetic number, because the mean of its divisors is an integer number (924303701568).

Almost surely, 2^{3661664663801} is an apocalyptic number.

It is an amenable number.

3661664663801 is a deficient number, since it is larger than the sum of its proper divisors (35550142471).

3661664663801 is a wasteful number, since it uses less digits than its factorization.

3661664663801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35550142470.

The product of its (nonzero) digits is 13436928, while the sum is 56.

The spelling of 3661664663801 in words is "three trillion, six hundred sixty-one billion, six hundred sixty-four million, six hundred sixty-three thousand, eight hundred one".