3949921647677 has 4 divisors (see below), whose sum is σ = 3984876706620. Its totient is φ = 3914966588736.

The previous prime is 3949921647671. The next prime is 3949921647733. The reversal of 3949921647677 is 7767461299493.

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 204841328836 + 3745080318841 = 452594^2 + 1935221^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949921647677 - 2²⁰ = 3949920599101 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 (3949921647671) 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, 17477529302 + ... + 17477529527.

It is an arithmetic number, because the mean of its divisors is an integer number (996219176655).

Almost surely, 2^{3949921647677} is an apocalyptic number.

It is an amenable number.

3949921647677 is a deficient number, since it is larger than the sum of its proper divisors (34955058943).

3949921647677 is a wasteful number, since it uses less digits than its factorization.

3949921647677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34955058942.

The product of its digits is 864162432, while the sum is 74.

The spelling of 3949921647677 in words is "three trillion, nine hundred forty-nine billion, nine hundred twenty-one million, six hundred forty-seven thousand, six hundred seventy-seven".