818685850309632 has 880 divisors, whose sum is σ = 2589150186830592. Its totient is φ = 257159736852480.

The previous prime is 818685850309619. The next prime is 818685850309633. The reversal of 818685850309632 is 236903058586818.

818685850309632 is a `hidden beast` number, since 8 + 1 + 8 + 6 + 8 + 58 + 503 + 0 + 9 + 63 + 2 = 666.

It is a Smith number, since the sum of its digits (72) 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 (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818685850309633) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 36000421782 + ... + 36000444522.

Almost surely, 2^{818685850309632} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818685850309632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294575093415296).

818685850309632 is an abundant number, since it is smaller than the sum of its proper divisors (1770464336520960).

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

818685850309632 is a wasteful number, since it uses less digits than its factorization.

818685850309632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23076 (or 23049 counting only the distinct ones).

The product of its (nonzero) digits is 597196800, while the sum is 72.

The spelling of 818685850309632 in words is "eight hundred eighteen trillion, six hundred eighty-five billion, eight hundred fifty million, three hundred nine thousand, six hundred thirty-two".