3926639661 has 16 divisors (see below), whose sum is σ = 6002700288. Its totient is φ = 2236575600.

The previous prime is 3926639641. The next prime is 3926639663. The reversal of 3926639661 is 1669366293.

It is a happy number.

It is not a de Polignac number, because 3926639661 - 2⁶ = 3926639597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3926639663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294085 + ... + 307146.

It is an arithmetic number, because the mean of its divisors is an integer number (375168768).

Almost surely, 2^3926639661 is an apocalyptic number.

It is an amenable number.

3926639661 is a deficient number, since it is larger than the sum of its proper divisors (2076060627).

3926639661 is a wasteful number, since it uses less digits than its factorization.

3926639661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601552.

The product of its digits is 1889568, while the sum is 51.

The square root of 3926639661 is about 62662.9049837302. The cubic root of 3926639661 is about 1577.6367571561.

The spelling of 3926639661 in words is "three billion, nine hundred twenty-six million, six hundred thirty-nine thousand, six hundred sixty-one".