3949966181613 has 32 divisors (see below), whose sum is σ = 5725970575360. Its totient is φ = 2412837745920.

The previous prime is 3949966181593. The next prime is 3949966181659. The reversal of 3949966181613 is 3161816699493.

It is not a de Polignac number, because 3949966181613 - 2¹³ = 3949966173421 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 (3949966181813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2395845 + ... + 3693237.

It is an arithmetic number, because the mean of its divisors is an integer number (178936580480).

Almost surely, 2^{3949966181613} is an apocalyptic number.

It is an amenable number.

3949966181613 is a deficient number, since it is larger than the sum of its proper divisors (1776004393747).

3949966181613 is a wasteful number, since it uses less digits than its factorization.

3949966181613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299169.

The product of its digits is 45349632, while the sum is 66.

The spelling of 3949966181613 in words is "three trillion, nine hundred forty-nine billion, nine hundred sixty-six million, one hundred eighty-one thousand, six hundred thirteen".