3163215661 has 4 divisors (see below), whose sum is σ = 3198757500. Its totient is φ = 3127673824.

The previous prime is 3163215659. The next prime is 3163215673. The reversal of 3163215661 is 1665123613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1665123613 = 2579 ⋅645647.

It can be written as a sum of positive squares in 2 ways, for example, as 205922500 + 2957293161 = 14350^2 + 54381^2 .

It is a cyclic number.

It is not a de Polignac number, because 3163215661 - 2¹ = 3163215659 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 (3163215631) 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, 17770786 + ... + 17770963.

It is an arithmetic number, because the mean of its divisors is an integer number (799689375).

Almost surely, 2^3163215661 is an apocalyptic number.

It is an amenable number.

3163215661 is a deficient number, since it is larger than the sum of its proper divisors (35541839).

3163215661 is an equidigital number, since it uses as much as digits as its factorization.

3163215661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35541838.

The product of its digits is 19440, while the sum is 34.

The square root of 3163215661 is about 56242.4720384871. The cubic root of 3163215661 is about 1467.9443804147.

The spelling of 3163215661 in words is "three billion, one hundred sixty-three million, two hundred fifteen thousand, six hundred sixty-one".