64642602240266 has 4 divisors (see below), whose sum is σ = 96963903360402. Its totient is φ = 32321301120132.

The previous prime is 64642602240259. The next prime is 64642602240269. The reversal of 64642602240266 is 66204220624646.

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., 52245126030241 + 12397476210025 = 7228079^2 + 3521005^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64642602240269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16160650560065 + ... + 16160650560068.

Almost surely, 2^{64642602240266} is an apocalyptic number.

64642602240266 is a deficient number, since it is larger than the sum of its proper divisors (32321301120136).

64642602240266 is a wasteful number, since it uses less digits than its factorization.

64642602240266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32321301120135.

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 64642602240266 in words is "sixty-four trillion, six hundred forty-two billion, six hundred two million, two hundred forty thousand, two hundred sixty-six".