8356661812 has 12 divisors (see below), whose sum is σ = 14625328900. Its totient is φ = 4177996416.

The previous prime is 8356661809. The next prime is 8356661821. The reversal of 8356661812 is 2181666538.

It can be written as a sum of positive squares in 2 ways, for example, as 2555706916 + 5800954896 = 50554^2 + 76164^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22437 + ... + 131212.

Almost surely, 2^8356661812 is an apocalyptic number.

It is an amenable number.

8356661812 is a deficient number, since it is larger than the sum of its proper divisors (6268667088).

8356661812 is a wasteful number, since it uses less digits than its factorization.

8356661812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167250 (or 167248 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 8356661812 is about 91414.7789583282. The cubic root of 8356661812 is about 2029.2907495018.

The spelling of 8356661812 in words is "eight billion, three hundred fifty-six million, six hundred sixty-one thousand, eight hundred twelve".