3663996997 has 4 divisors (see below), whose sum is σ = 3679722540. Its totient is φ = 3648271456.

The previous prime is 3663996989. The next prime is 3663997009. The reversal of 3663996997 is 7996993663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7996993663 = 64927 ⋅123169.

It can be written as a sum of positive squares in 2 ways, for example, as 1558196676 + 2105800321 = 39474^2 + 45889^2 .

It is a cyclic number.

It is not a de Polignac number, because 3663996997 - 2³ = 3663996989 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 (3663996197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7862422 + ... + 7862887.

It is an arithmetic number, because the mean of its divisors is an integer number (919930635).

Almost surely, 2^3663996997 is an apocalyptic number.

It is an amenable number.

3663996997 is a deficient number, since it is larger than the sum of its proper divisors (15725543).

3663996997 is a wasteful number, since it uses less digits than its factorization.

3663996997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15725542.

The product of its digits is 89282088, while the sum is 67.

The square root of 3663996997 is about 60530.9589962029. The cubic root of 3663996997 is about 1541.6473344557.

The spelling of 3663996997 in words is "three billion, six hundred sixty-three million, nine hundred ninety-six thousand, nine hundred ninety-seven".