165942556301 has 4 divisors (see below), whose sum is σ = 167209293504. Its totient is φ = 164675819100.

The previous prime is 165942556271. The next prime is 165942556309. The reversal of 165942556301 is 103655249561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165942556301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165942556309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633368405 + ... + 633368666.

It is an arithmetic number, because the mean of its divisors is an integer number (41802323376).

Almost surely, 2^165942556301 is an apocalyptic number.

It is an amenable number.

165942556301 is a deficient number, since it is larger than the sum of its proper divisors (1266737203).

165942556301 is a wasteful number, since it uses less digits than its factorization.

165942556301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266737202.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 165942556301 in words is "one hundred sixty-five billion, nine hundred forty-two million, five hundred fifty-six thousand, three hundred one".