165756046418 has 4 divisors (see below), whose sum is σ = 248634069630. Its totient is φ = 82878023208.

The previous prime is 165756046387. The next prime is 165756046487. The reversal of 165756046418 is 814640657561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814640657561 = 23879 ⋅34115359.

It can be written as a sum of positive squares in only one way, i.e., 157320909769 + 8435136649 = 396637^2 + 91843^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165756046418.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41439011603 + ... + 41439011606.

Almost surely, 2^165756046418 is an apocalyptic number.

165756046418 is a deficient number, since it is larger than the sum of its proper divisors (82878023212).

165756046418 is an equidigital number, since it uses as much as digits as its factorization.

165756046418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82878023211.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 165756046418 in words is "one hundred sixty-five billion, seven hundred fifty-six million, forty-six thousand, four hundred eighteen".