10266651665 has 16 divisors (see below), whose sum is σ = 12526597056. Its totient is φ = 8075678400.

The previous prime is 10266651649. The next prime is 10266651667. The reversal of 10266651665 is 56615666201.

It is a happy number.

It is not a de Polignac number, because 10266651665 - 2⁴ = 10266651649 is a prime.

It is a super-4 number, since 4×10266651665⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10266651667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1194674 + ... + 1203236.

It is an arithmetic number, because the mean of its divisors is an integer number (782912316).

Almost surely, 2^10266651665 is an apocalyptic number.

It is an amenable number.

10266651665 is a deficient number, since it is larger than the sum of its proper divisors (2259945391).

10266651665 is an equidigital number, since it uses as much as digits as its factorization.

10266651665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 10266651665 in words is "ten billion, two hundred sixty-six million, six hundred fifty-one thousand, six hundred sixty-five".