266006663506025 has 12 divisors (see below), whose sum is σ = 355221206036172. Its totient is φ = 196435689973440.

The previous prime is 266006663506019. The next prime is 266006663506223. The reversal of 266006663506025 is 520605366600662.

It can be written as a sum of positive squares in 6 ways, for example, as 58389572668249 + 207617090837776 = 7641307^2 + 14408924^2 .

It is not a de Polignac number, because 266006663506025 - 2²⁸ = 266006395070569 is a prime.

It is a super-2 number, since 2×266006663506025² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409241020454 + ... + 409241021103.

It is an arithmetic number, because the mean of its divisors is an integer number (29601767169681).

Almost surely, 2^{266006663506025} is an apocalyptic number.

266006663506025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

266006663506025 is a deficient number, since it is larger than the sum of its proper divisors (89214542530147).

266006663506025 is a wasteful number, since it uses less digits than its factorization.

266006663506025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818482041580 (or 818482041575 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 53.

The spelling of 266006663506025 in words is "two hundred sixty-six trillion, six billion, six hundred sixty-three million, five hundred six thousand, twenty-five".