266138725857 has 8 divisors (see below), whose sum is σ = 355123140576. Its totient is φ = 177290064192.

The previous prime is 266138725841. The next prime is 266138725877. The reversal of 266138725857 is 758527831662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 266138725857 - 2⁴ = 266138725841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266138725857.

It is not an unprimeable number, because it can be changed into a prime (266138725877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33933688 + ... + 33941529.

It is an arithmetic number, because the mean of its divisors is an integer number (44390392572).

Almost surely, 2^266138725857 is an apocalyptic number.

It is an amenable number.

266138725857 is a deficient number, since it is larger than the sum of its proper divisors (88984414719).

266138725857 is a wasteful number, since it uses less digits than its factorization.

266138725857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67876527.

The product of its digits is 33868800, while the sum is 60.

The spelling of 266138725857 in words is "two hundred sixty-six billion, one hundred thirty-eight million, seven hundred twenty-five thousand, eight hundred fifty-seven".