218091986352 has 40 divisors (see below), whose sum is σ = 626004776880. Its totient is φ = 72697328640.

The previous prime is 218091986351. The next prime is 218091986369. The reversal of 218091986352 is 253689190812.

218091986352 is a `hidden beast` number, since 21 + 80 + 9 + 198 + 6 + 352 = 666.

It is a super-2 number, since 2×218091986352² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (218091986351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252420849 + ... + 252421712.

It is an arithmetic number, because the mean of its divisors is an integer number (15650119422).

Almost surely, 2^218091986352 is an apocalyptic number.

It is an amenable number.

218091986352 is an abundant number, since it is smaller than the sum of its proper divisors (407912790528).

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

218091986352 is a wasteful number, since it uses less digits than its factorization.

218091986352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504842578 (or 504842566 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 218091986352 in words is "two hundred eighteen billion, ninety-one million, nine hundred eighty-six thousand, three hundred fifty-two".