664263542211266 has 4 divisors (see below), whose sum is σ = 996395313316902. Its totient is φ = 332131771105632.

The previous prime is 664263542211257. The next prime is 664263542211323. The reversal of 664263542211266 is 662112245362466.

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., 601828591518025 + 62434950693241 = 24532195^2 + 7901579^2 .

It is a super-2 number, since 2×664263542211266² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166065885552815 + ... + 166065885552818.

Almost surely, 2^{664263542211266} is an apocalyptic number.

664263542211266 is a deficient number, since it is larger than the sum of its proper divisors (332131771105636).

664263542211266 is a wasteful number, since it uses less digits than its factorization.

664263542211266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332131771105635.

The product of its digits is 29859840, while the sum is 56.

The spelling of 664263542211266 in words is "six hundred sixty-four trillion, two hundred sixty-three billion, five hundred forty-two million, two hundred eleven thousand, two hundred sixty-six".