2131563666 has 32 divisors (see below), whose sum is σ = 4525355520. Its totient is φ = 667028736.

The previous prime is 2131563631. The next prime is 2131563667. The reversal of 2131563666 is 6663651312.

It is a happy number.

It is a super-2 number, since 2×2131563666² = 9087127324422719112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2131563667) 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, 14175 + ... + 66813.

It is an arithmetic number, because the mean of its divisors is an integer number (141417360).

Almost surely, 2^2131563666 is an apocalyptic number.

2131563666 is an abundant number, since it is smaller than the sum of its proper divisors (2393791854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131563666 is a wasteful number, since it uses less digits than its factorization.

2131563666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53058.

The product of its digits is 116640, while the sum is 39.

The square root of 2131563666 is about 46168.8603498072. The cubic root of 2131563666 is about 1286.9631237061.

The spelling of 2131563666 in words is "two billion, one hundred thirty-one million, five hundred sixty-three thousand, six hundred sixty-six".