166602010261 has 4 divisors (see below), whose sum is σ = 166602850624. Its totient is φ = 166601169900.

The previous prime is 166602010229. The next prime is 166602010313. The reversal of 166602010261 is 162010206661.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 166602010261 - 2⁵ = 166602010229 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 (166605010261) 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, 60466 + ... + 580396.

It is an arithmetic number, because the mean of its divisors is an integer number (41650712656).

Almost surely, 2^166602010261 is an apocalyptic number.

It is an amenable number.

166602010261 is a deficient number, since it is larger than the sum of its proper divisors (840363).

166602010261 is an equidigital number, since it uses as much as digits as its factorization.

166602010261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840362.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 166602010261 in words is "one hundred sixty-six billion, six hundred two million, ten thousand, two hundred sixty-one".