10266065721 has 24 divisors (see below), whose sum is σ = 15024372480. Its totient is φ = 6753854016.

The previous prime is 10266065683. The next prime is 10266065729. The reversal of 10266065721 is 12756066201.

It is a happy number.

10266065721 is a `hidden beast` number, since 1 + 0 + 26 + 60 + 6 + 572 + 1 = 666.

It is not a de Polignac number, because 10266065721 - 2⁶ = 10266065657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10266065729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2676421 + ... + 2680253.

It is an arithmetic number, because the mean of its divisors is an integer number (626015520).

Almost surely, 2^10266065721 is an apocalyptic number.

It is an amenable number.

10266065721 is a deficient number, since it is larger than the sum of its proper divisors (4758306759).

10266065721 is a wasteful number, since it uses less digits than its factorization.

10266065721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7685 (or 7682 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 10266065721 in words is "ten billion, two hundred sixty-six million, sixty-five thousand, seven hundred twenty-one".