166255226552621 has 16 divisors (see below), whose sum is σ = 166823125795200. Its totient is φ = 165688120382400.

The previous prime is 166255226552579. The next prime is 166255226552641. The reversal of 166255226552621 is 126255622552661.

166255226552621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 166255226552621 - 2²⁶ = 166255159443757 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 (166255226552641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3499570550 + ... + 3499618056.

It is an arithmetic number, because the mean of its divisors is an integer number (10426445362200).

Almost surely, 2^{166255226552621} is an apocalyptic number.

It is an amenable number.

166255226552621 is a deficient number, since it is larger than the sum of its proper divisors (567899242579).

166255226552621 is a wasteful number, since it uses less digits than its factorization.

166255226552621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55604.

The product of its digits is 25920000, while the sum is 56.

The spelling of 166255226552621 in words is "one hundred sixty-six trillion, two hundred fifty-five billion, two hundred twenty-six million, five hundred fifty-two thousand, six hundred twenty-one".