168591089386 has 4 divisors (see below), whose sum is σ = 252886634082. Its totient is φ = 84295544692.

The previous prime is 168591089363. The next prime is 168591089399. The reversal of 168591089386 is 683980195861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 128436941161 + 40154148225 = 358381^2 + 200385^2 .

It is a super-3 number, since 3×168591089386³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42147772345 + ... + 42147772348.

Almost surely, 2^168591089386 is an apocalyptic number.

168591089386 is a deficient number, since it is larger than the sum of its proper divisors (84295544696).

168591089386 is an equidigital number, since it uses as much as digits as its factorization.

168591089386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84295544695.

The product of its (nonzero) digits is 22394880, while the sum is 64.

The spelling of 168591089386 in words is "one hundred sixty-eight billion, five hundred ninety-one million, eighty-nine thousand, three hundred eighty-six".