3921692725813 has 8 divisors (see below), whose sum is σ = 4046667450840. Its totient is φ = 3798114366720.

The previous prime is 3921692725807. The next prime is 3921692725859. The reversal of 3921692725813 is 3185272961293.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 987604651089 + 2934088074724 = 993783^2 + 1712918^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3921692725813 - 2²⁹ = 3921155854901 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 (3921692725883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349085778 + ... + 349097011.

It is an arithmetic number, because the mean of its divisors is an integer number (505833431355).

Almost surely, 2^{3921692725813} is an apocalyptic number.

It is an amenable number.

3921692725813 is a deficient number, since it is larger than the sum of its proper divisors (124974725027).

3921692725813 is a wasteful number, since it uses less digits than its factorization.

3921692725813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698182967.

The product of its digits is 9797760, while the sum is 58.

The spelling of 3921692725813 in words is "three trillion, nine hundred twenty-one billion, six hundred ninety-two million, seven hundred twenty-five thousand, eight hundred thirteen".