642566665246 has 8 divisors (see below), whose sum is σ = 1051472724984. Its totient is φ = 292075756920.

The previous prime is 642566665241. The next prime is 642566665297.

642566665246 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642566665241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14603787825 + ... + 14603787868.

It is an arithmetic number, because the mean of its divisors is an integer number (131434090623).

Almost surely, 2^642566665246 is an apocalyptic number.

642566665246 is a deficient number, since it is larger than the sum of its proper divisors (408906059738).

642566665246 is a wasteful number, since it uses less digits than its factorization.

642566665246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29207575706.

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

The spelling of 642566665246 in words is "six hundred forty-two billion, five hundred sixty-six million, six hundred sixty-five thousand, two hundred forty-six".