3942684403661 has 8 divisors (see below), whose sum is σ = 4084885059480. Its totient is φ = 3800900149312.

The previous prime is 3942684403649. The next prime is 3942684403663. The reversal of 3942684403661 is 1663044862493.

It can be written as a sum of positive squares in 4 ways, for example, as 18596776900 + 3924087626761 = 136370^2 + 1980931^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3942684403661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3942684403597 and 3942684403606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3942684403663) 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, 104081090 + ... + 104118963.

It is an arithmetic number, because the mean of its divisors is an integer number (510610632435).

Almost surely, 2^{3942684403661} is an apocalyptic number.

It is an amenable number.

3942684403661 is a deficient number, since it is larger than the sum of its proper divisors (142200655819).

3942684403661 is a wasteful number, since it uses less digits than its factorization.

3942684403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208200735.

The product of its (nonzero) digits is 17915904, while the sum is 56.

The spelling of 3942684403661 in words is "three trillion, nine hundred forty-two billion, six hundred eighty-four million, four hundred three thousand, six hundred sixty-one".