266620601972 has 12 divisors (see below), whose sum is σ = 467222601636. Its totient is φ = 133128430080.

The previous prime is 266620601971. The next prime is 266620602007. The reversal of 266620601972 is 279106026662.

It can be written as a sum of positive squares in 2 ways, for example, as 264551807716 + 2068794256 = 514346^2 + 45484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266620601971) 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, 45464429 + ... + 45470292.

It is an arithmetic number, because the mean of its divisors is an integer number (38935216803).

Almost surely, 2^266620601972 is an apocalyptic number.

It is an amenable number.

266620601972 is a deficient number, since it is larger than the sum of its proper divisors (200601999664).

266620601972 is a wasteful number, since it uses less digits than its factorization.

266620601972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90935458 (or 90935456 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 266620601972 in words is "two hundred sixty-six billion, six hundred twenty million, six hundred one thousand, nine hundred seventy-two".