266665690125 has 96 divisors (see below), whose sum is σ = 498013850880. Its totient is φ = 137116425600.

The previous prime is 266665690069. The next prime is 266665690129. The reversal of 266665690125 is 521096566662.

It is a happy number.

It is not a de Polignac number, because 266665690125 - 2²¹ = 266663592973 is a prime.

It is a super-2 number, since 2×266665690125² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266665690129) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23712754 + ... + 23723996.

It is an arithmetic number, because the mean of its divisors is an integer number (5187644280).

Almost surely, 2^266665690125 is an apocalyptic number.

266665690125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

266665690125 is a deficient number, since it is larger than the sum of its proper divisors (231348160755).

266665690125 is a wasteful number, since it uses less digits than its factorization.

266665690125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12020 (or 12007 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 266665690125 in words is "two hundred sixty-six billion, six hundred sixty-five million, six hundred ninety thousand, one hundred twenty-five".