22166390988 has 108 divisors (see below), whose sum is σ = 66496345552. Its totient is φ = 6333202080.

The previous prime is 22166390971. The next prime is 22166390989. The reversal of 22166390988 is 88909366122.

22166390988 is a `hidden beast` number, since 2 + 2 + 166 + 390 + 98 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a super-2 number, since 2×22166390988² (a number of 21 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 (22166390989) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 123378 + ... + 244038.

Almost surely, 2^22166390988 is an apocalyptic number.

22166390988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22166390988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33248172776).

22166390988 is an abundant number, since it is smaller than the sum of its proper divisors (44329954564).

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

22166390988 is an equidigital number, since it uses as much as digits as its factorization.

22166390988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120696 (or 120673 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 22166390988 in words is "twenty-two billion, one hundred sixty-six million, three hundred ninety thousand, nine hundred eighty-eight".