215623532401266 has 16 divisors (see below), whose sum is σ = 470451343421088. Its totient is φ = 65340464364000.

The previous prime is 215623532401247. The next prime is 215623532401273. The reversal of 215623532401266 is 662104235326512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1633511609035 + ... + 1633511609166.

It is an arithmetic number, because the mean of its divisors is an integer number (29403208963818).

Almost surely, 2^{215623532401266} is an apocalyptic number.

215623532401266 is an abundant number, since it is smaller than the sum of its proper divisors (254827811019822).

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

215623532401266 is a wasteful number, since it uses less digits than its factorization.

215623532401266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3267023218217.

The product of its (nonzero) digits is 3110400, while the sum is 48.

Adding to 215623532401266 its reverse (662104235326512), we get a palindrome (877727767727778).

The spelling of 215623532401266 in words is "two hundred fifteen trillion, six hundred twenty-three billion, five hundred thirty-two million, four hundred one thousand, two hundred sixty-six".