66126063266 has 4 divisors (see below), whose sum is σ = 99189094902. Its totient is φ = 33063031632.

The previous prime is 66126063239. The next prime is 66126063281. The reversal of 66126063266 is 66236062166.

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., 64016590225 + 2109473041 = 253015^2 + 45929^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16531515815 + ... + 16531515818.

Almost surely, 2^66126063266 is an apocalyptic number.

66126063266 is a deficient number, since it is larger than the sum of its proper divisors (33063031636).

66126063266 is a wasteful number, since it uses less digits than its factorization.

66126063266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33063031635.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 66126063266 in words is "sixty-six billion, one hundred twenty-six million, sixty-three thousand, two hundred sixty-six".