642645342866 has 16 divisors (see below), whose sum is σ = 964741028640. Its totient is φ = 321065065440.

The previous prime is 642645342851. The next prime is 642645342901. The reversal of 642645342866 is 668243546246.

It is a Curzon number.

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, 30048965 + ... + 30070343.

It is an arithmetic number, because the mean of its divisors is an integer number (60296314290).

Almost surely, 2^642645342866 is an apocalyptic number.

642645342866 is a deficient number, since it is larger than the sum of its proper divisors (322095685774).

642645342866 is a wasteful number, since it uses less digits than its factorization.

642645342866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32729.

The product of its digits is 39813120, while the sum is 56.

The spelling of 642645342866 in words is "six hundred forty-two billion, six hundred forty-five million, three hundred forty-two thousand, eight hundred sixty-six".