1216526445266 has 32 divisors (see below), whose sum is σ = 2077396702848. Its totient is φ = 528882330240.

The previous prime is 1216526445221. The next prime is 1216526445269. The reversal of 1216526445266 is 6625446256121.

It is not an unprimeable number, because it can be changed into a prime (1216526445269) 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, 6730166 + ... + 6908558.

It is an arithmetic number, because the mean of its divisors is an integer number (64918646964).

Almost surely, 2^{1216526445266} is an apocalyptic number.

1216526445266 is a deficient number, since it is larger than the sum of its proper divisors (860870257582).

1216526445266 is a wasteful number, since it uses less digits than its factorization.

1216526445266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191906.

The product of its digits is 4147200, while the sum is 50.

The spelling of 1216526445266 in words is "one trillion, two hundred sixteen billion, five hundred twenty-six million, four hundred forty-five thousand, two hundred sixty-six".