168541012091 has 2 divisors, whose sum is σ = 168541012092. Its totient is φ = 168541012090.

The previous prime is 168541012069. The next prime is 168541012117. The reversal of 168541012091 is 190210145861.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168541012091 - 2¹⁸ = 168540749947 is a prime.

It is not a weakly prime, because it can be changed into another prime (168541032091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84270506045 + 84270506046.

It is an arithmetic number, because the mean of its divisors is an integer number (84270506046).

Almost surely, 2^168541012091 is an apocalyptic number.

168541012091 is a deficient number, since it is larger than the sum of its proper divisors (1).

168541012091 is an equidigital number, since it uses as much as digits as its factorization.

168541012091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 168541012091 in words is "one hundred sixty-eight billion, five hundred forty-one million, twelve thousand, ninety-one".