3181516666506 has 12 divisors (see below), whose sum is σ = 6893286110802. Its totient is φ = 1060505555496.

The previous prime is 3181516666499. The next prime is 3181516666507. The reversal of 3181516666506 is 6056666151813.

It can be written as a sum of positive squares in only one way, i.e., 3057689390625 + 123827275881 = 1748625^2 + 351891^2 .

It is not an unprimeable number, because it can be changed into a prime (3181516666507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88375462941 + ... + 88375462976.

Almost surely, 2^{3181516666506} is an apocalyptic number.

3181516666506 is an abundant number, since it is smaller than the sum of its proper divisors (3711769444296).

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

3181516666506 is a wasteful number, since it uses less digits than its factorization.

3181516666506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176750925925 (or 176750925922 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 3181516666506 in words is "three trillion, one hundred eighty-one billion, five hundred sixteen million, six hundred sixty-six thousand, five hundred six".