165186641291949 has 6 divisors (see below), whose sum is σ = 238602926310606. Its totient is φ = 110124427527960.

The previous prime is 165186641291873. The next prime is 165186641292019. The reversal of 165186641291949 is 949192146681561.

165186641291949 is a `hidden beast` number, since 1 + 6 + 5 + 1 + 86 + 6 + 412 + 91 + 9 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 155866485622500 + 9320155669449 = 12484650^2 + 3052893^2 .

It is not a de Polignac number, because 165186641291949 - 2⁷ = 165186641291821 is a prime.

It is a super-2 number, since 2×165186641291949² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165186641251949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9177035627322 + ... + 9177035627339.

It is an arithmetic number, because the mean of its divisors is an integer number (39767154385101).

Almost surely, 2^{165186641291949} is an apocalyptic number.

It is an amenable number.

165186641291949 is a deficient number, since it is larger than the sum of its proper divisors (73416285018657).

165186641291949 is a wasteful number, since it uses less digits than its factorization.

165186641291949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18354071254667 (or 18354071254664 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 72.

The spelling of 165186641291949 in words is "one hundred sixty-five trillion, one hundred eighty-six billion, six hundred forty-one million, two hundred ninety-one thousand, nine hundred forty-nine".