266397728728 has 32 divisors (see below), whose sum is σ = 501180694560. Its totient is φ = 132749729280.

The previous prime is 266397728677. The next prime is 266397728869. The reversal of 266397728728 is 827827793662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16077568 + ... + 16094128.

It is an arithmetic number, because the mean of its divisors is an integer number (15661896705).

Almost surely, 2^266397728728 is an apocalyptic number.

It is an amenable number.

266397728728 is a deficient number, since it is larger than the sum of its proper divisors (234782965832).

266397728728 is a wasteful number, since it uses less digits than its factorization.

266397728728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23227 (or 23223 counting only the distinct ones).

The product of its digits is 170698752, while the sum is 67.

The spelling of 266397728728 in words is "two hundred sixty-six billion, three hundred ninety-seven million, seven hundred twenty-eight thousand, seven hundred twenty-eight".