165042626053421 has 4 divisors (see below), whose sum is σ = 165042716019072. Its totient is φ = 165042536087772.

The previous prime is 165042626053411. The next prime is 165042626053453. The reversal of 165042626053421 is 124350626240561.

165042626053421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-165042626053421 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 (165042626053411) 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, 42172541 + ... + 45919586.

It is an arithmetic number, because the mean of its divisors is an integer number (41260679004768).

Almost surely, 2^{165042626053421} is an apocalyptic number.

It is an amenable number.

165042626053421 is a deficient number, since it is larger than the sum of its proper divisors (89965651).

165042626053421 is an equidigital number, since it uses as much as digits as its factorization.

165042626053421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89965650.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 165042626053421 in words is "one hundred sixty-five trillion, forty-two billion, six hundred twenty-six million, fifty-three thousand, four hundred twenty-one".