3181815165186 has 160 divisors (see below), whose sum is σ = 8251298660352. Its totient is φ = 897648726240.

The previous prime is 3181815165163. The next prime is 3181815165241. The reversal of 3181815165186 is 6815615181813.

3181815165186 is a `hidden beast` number, since 31 + 8 + 1 + 81 + 5 + 16 + 518 + 6 = 666.

It is a super-2 number, since 2×3181815165186² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 30335445 + ... + 30440151.

Almost surely, 2^{3181815165186} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3181815165186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4125649330176).

3181815165186 is an abundant number, since it is smaller than the sum of its proper divisors (5069483495166).

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

3181815165186 is a wasteful number, since it uses less digits than its factorization.

3181815165186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105066 (or 105057 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 54.

The spelling of 3181815165186 in words is "three trillion, one hundred eighty-one billion, eight hundred fifteen million, one hundred sixty-five thousand, one hundred eighty-six".