81770416218 has 32 divisors (see below), whose sum is σ = 181722153600. Its totient is φ = 27255287808.

The previous prime is 81770416207. The next prime is 81770416219. The reversal of 81770416218 is 81261407718.

81770416218 is a `hidden beast` number, since 8 + 17 + 7 + 0 + 4 + 1 + 621 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (81770416219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371738 + ... + 1430106.

It is an arithmetic number, because the mean of its divisors is an integer number (5678817300).

Almost surely, 2^81770416218 is an apocalyptic number.

81770416218 is an abundant number, since it is smaller than the sum of its proper divisors (99951737382).

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

81770416218 is a wasteful number, since it uses less digits than its factorization.

81770416218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84323 (or 84317 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The spelling of 81770416218 in words is "eighty-one billion, seven hundred seventy million, four hundred sixteen thousand, two hundred eighteen".