165091250836394 has 4 divisors (see below), whose sum is σ = 247636876254594. Its totient is φ = 82545625418196.

The previous prime is 165091250836373. The next prime is 165091250836409. The reversal of 165091250836394 is 493638052190561.

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., 134978737261225 + 30112513575169 = 11618035^2 + 5487487^2 .

It is a super-2 number, since 2×165091250836394² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41272812709097 + ... + 41272812709100.

Almost surely, 2^{165091250836394} is an apocalyptic number.

165091250836394 is a deficient number, since it is larger than the sum of its proper divisors (82545625418200).

165091250836394 is an equidigital number, since it uses as much as digits as its factorization.

165091250836394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82545625418199.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 165091250836394 in words is "one hundred sixty-five trillion, ninety-one billion, two hundred fifty million, eight hundred thirty-six thousand, three hundred ninety-four".