642688886246 has 16 divisors (see below), whose sum is σ = 1051913372688. Its totient is φ = 292064464800.

The previous prime is 642688886243. The next prime is 642688886261.

It is a happy number.

642688886246 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×642688886246³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642688886243) 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, 3243965 + ... + 3436376.

It is an arithmetic number, because the mean of its divisors is an integer number (65744585793).

Almost surely, 2^642688886246 is an apocalyptic number.

642688886246 is a deficient number, since it is larger than the sum of its proper divisors (409224486442).

642688886246 is a wasteful number, since it uses less digits than its factorization.

642688886246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684727.

The product of its digits is 339738624, while the sum is 68.

The spelling of 642688886246 in words is "six hundred forty-two billion, six hundred eighty-eight million, eight hundred eighty-six thousand, two hundred forty-six".