3661664663896 has 16 divisors (see below), whose sum is σ = 6907741623000. Its totient is φ = 1819600231104.

The previous prime is 3661664663857. The next prime is 3661664663897. The reversal of 3661664663896 is 6983664661663.

It is a super-2 number, since 2×3661664663896² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661664663897) by changing a digit.

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, 1404011221 + ... + 1404013828.

Almost surely, 2^{3661664663896} is an apocalyptic number.

It is an amenable number.

3661664663896 is a deficient number, since it is larger than the sum of its proper divisors (3246076959104).

3661664663896 is a wasteful number, since it uses less digits than its factorization.

3661664663896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808025218 (or 2808025214 counting only the distinct ones).

The product of its digits is 725594112, while the sum is 70.

The spelling of 3661664663896 in words is "three trillion, six hundred sixty-one billion, six hundred sixty-four million, six hundred sixty-three thousand, eight hundred ninety-six".