266521216426042 has 4 divisors (see below), whose sum is σ = 399781824639066. Its totient is φ = 133260608213020.

The previous prime is 266521216426007. The next prime is 266521216426043. The reversal of 266521216426042 is 240624612125662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 225613948243401 + 40907268182641 = 15020451^2 + 6395879^2 .

It is not an unprimeable number, because it can be changed into a prime (266521216426043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66630304106509 + ... + 66630304106512.

Almost surely, 2^{266521216426042} is an apocalyptic number.

266521216426042 is a deficient number, since it is larger than the sum of its proper divisors (133260608213024).

266521216426042 is a wasteful number, since it uses less digits than its factorization.

266521216426042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133260608213023.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 266521216426042 in words is "two hundred sixty-six trillion, five hundred twenty-one billion, two hundred sixteen million, four hundred twenty-six thousand, forty-two".