166552252541501 has 4 divisors (see below), whose sum is σ = 166552635893052. Its totient is φ = 166551869189952.

The previous prime is 166552252541471. The next prime is 166552252541579. The reversal of 166552252541501 is 105145252255661.

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 129933234178276 + 36619018363225 = 11398826^2 + 6051365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166552252541501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166552252541501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166552252541581) 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, 191023340 + ... + 191893253.

It is an arithmetic number, because the mean of its divisors is an integer number (41638158973263).

Almost surely, 2^{166552252541501} is an apocalyptic number.

It is an amenable number.

166552252541501 is a deficient number, since it is larger than the sum of its proper divisors (383351551).

166552252541501 is an equidigital number, since it uses as much as digits as its factorization.

166552252541501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383351550.

The product of its (nonzero) digits is 3600000, while the sum is 50.

The spelling of 166552252541501 in words is "one hundred sixty-six trillion, five hundred fifty-two billion, two hundred fifty-two million, five hundred forty-one thousand, five hundred one".