642689986246 has 16 divisors (see below), whose sum is σ = 1201913740800. Its totient is φ = 250398695880.

The previous prime is 642689986243. The next prime is 642689986247.

642689986246 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642689986243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2086655646 + ... + 2086655953.

It is an arithmetic number, because the mean of its divisors is an integer number (75119608800).

Almost surely, 2^642689986246 is an apocalyptic number.

642689986246 is a deficient number, since it is larger than the sum of its proper divisors (559223754554).

642689986246 is a wasteful number, since it uses less digits than its factorization.

642689986246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173311619.

The product of its digits is 429981696, while the sum is 70.

The spelling of 642689986246 in words is "six hundred forty-two billion, six hundred eighty-nine million, nine hundred eighty-six thousand, two hundred forty-six".