8181366487202 has 4 divisors (see below), whose sum is σ = 12272049730806. Its totient is φ = 4090683243600.

The previous prime is 8181366487201. The next prime is 8181366487219. The reversal of 8181366487202 is 2027846631818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7765200865321 + 416165621881 = 2786611^2 + 645109^2 .

It is not an unprimeable number, because it can be changed into a prime (8181366487201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045341621799 + ... + 2045341621802.

Almost surely, 2^{8181366487202} is an apocalyptic number.

8181366487202 is a deficient number, since it is larger than the sum of its proper divisors (4090683243604).

8181366487202 is a wasteful number, since it uses less digits than its factorization.

8181366487202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090683243603.

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 8181366487202 in words is "eight trillion, one hundred eighty-one billion, three hundred sixty-six million, four hundred eighty-seven thousand, two hundred two".