266121021016064 has 48 divisors (see below), whose sum is σ = 536821057232460. Its totient is φ = 131882983751680.

The previous prime is 266121021016061. The next prime is 266121021016069. The reversal of 266121021016064 is 460610120121662.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 259498592281600 + 6622428734464 = 16108960^2 + 2573408^2 .

It is not an unprimeable number, because it can be changed into a prime (266121021016061) 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, 574732757 + ... + 575195604.

Almost surely, 2^{266121021016064} is an apocalyptic number.

It is an amenable number.

266121021016064 is an abundant number, since it is smaller than the sum of its proper divisors (270700036216396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266121021016064 is a wasteful number, since it uses less digits than its factorization.

266121021016064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149928496 (or 1149928476 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 266121021016064 in words is "two hundred sixty-six trillion, one hundred twenty-one billion, twenty-one million, sixteen thousand, sixty-four".