255166066661 has 4 divisors (see below), whose sum is σ = 278362981824. Its totient is φ = 231969151500.

The previous prime is 255166066627. The next prime is 255166066681. The reversal of 255166066661 is 166660661552.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255166066661 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 (255166066621) 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, 11598457565 + ... + 11598457586.

It is an arithmetic number, because the mean of its divisors is an integer number (69590745456).

Almost surely, 2^255166066661 is an apocalyptic number.

It is an amenable number.

255166066661 is a deficient number, since it is larger than the sum of its proper divisors (23196915163).

255166066661 is a wasteful number, since it uses less digits than its factorization.

255166066661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23196915162.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 255166066661 in words is "two hundred fifty-five billion, one hundred sixty-six million, sixty-six thousand, six hundred sixty-one".