165214260521 has 4 divisors (see below), whose sum is σ = 174932746452. Its totient is φ = 155495774592.

The previous prime is 165214260517. The next prime is 165214260529. The reversal of 165214260521 is 125062412561.

165214260521 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.

It can be written as a sum of positive squares in 2 ways, for example, as 64141134121 + 101073126400 = 253261^2 + 317920^2 .

It is a cyclic number.

It is not a de Polignac number, because 165214260521 - 2² = 165214260517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165214260529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859242940 + ... + 4859242973.

It is an arithmetic number, because the mean of its divisors is an integer number (43733186613).

Almost surely, 2^165214260521 is an apocalyptic number.

It is an amenable number.

165214260521 is a deficient number, since it is larger than the sum of its proper divisors (9718485931).

165214260521 is an equidigital number, since it uses as much as digits as its factorization.

165214260521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9718485930.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 165214260521 in words is "one hundred sixty-five billion, two hundred fourteen million, two hundred sixty thousand, five hundred twenty-one".