642665566246 has 64 divisors (see below), whose sum is σ = 1134467389440. Its totient is φ = 269780544000.

The previous prime is 642665566219. The next prime is 642665566261.

642665566246 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9525451 + ... + 9592681.

It is an arithmetic number, because the mean of its divisors is an integer number (17726052960).

Almost surely, 2^642665566246 is an apocalyptic number.

642665566246 is a deficient number, since it is larger than the sum of its proper divisors (491801823194).

642665566246 is a wasteful number, since it uses less digits than its factorization.

642665566246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67741.

The product of its digits is 74649600, while the sum is 58.

The spelling of 642665566246 in words is "six hundred forty-two billion, six hundred sixty-five million, five hundred sixty-six thousand, two hundred forty-six".