165236625401 has 4 divisors (see below), whose sum is σ = 170934440100. Its totient is φ = 159538810704.

The previous prime is 165236625397. The next prime is 165236625403. The reversal of 165236625401 is 104526632561.

It is a happy number.

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 135626475625 + 29610149776 = 368275^2 + 172076^2 .

It is a cyclic number.

It is not a de Polignac number, because 165236625401 - 2² = 165236625397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165236625403) 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, 2848907306 + ... + 2848907363.

It is an arithmetic number, because the mean of its divisors is an integer number (42733610025).

Almost surely, 2^165236625401 is an apocalyptic number.

It is an amenable number.

165236625401 is a deficient number, since it is larger than the sum of its proper divisors (5697814699).

165236625401 is an equidigital number, since it uses as much as digits as its factorization.

165236625401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697814698.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 165236625401 in words is "one hundred sixty-five billion, two hundred thirty-six million, six hundred twenty-five thousand, four hundred one".