3186997661 has 8 divisors (see below), whose sum is σ = 3401985600. Its totient is φ = 2976734880.

The previous prime is 3186997657. The next prime is 3186997663. The reversal of 3186997661 is 1667996813.

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 3186997661 - 2² = 3186997657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3186997597 and 3186997606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3186997663) 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, 1179896 + ... + 1182593.

It is an arithmetic number, because the mean of its divisors is an integer number (425248200).

Almost surely, 2^3186997661 is an apocalyptic number.

It is an amenable number.

3186997661 is a deficient number, since it is larger than the sum of its proper divisors (214987939).

3186997661 is a wasteful number, since it uses less digits than its factorization.

3186997661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362579.

The product of its digits is 2939328, while the sum is 56.

The square root of 3186997661 is about 56453.4999889289. The cubic root of 3186997661 is about 1471.6140140009.

The spelling of 3186997661 in words is "three billion, one hundred eighty-six million, nine hundred ninety-seven thousand, six hundred sixty-one".