642640046246 has 16 divisors (see below), whose sum is σ = 1058556999168. Its totient is φ = 290174613000.

The previous prime is 642640046149. The next prime is 642640046267.

642640046246 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×642640046246² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642640046197 and 642640046206.

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 7 ways as a sum of consecutive naturals, for example, 96721550 + ... + 96728193.

It is an arithmetic number, because the mean of its divisors is an integer number (66159812448).

Almost surely, 2^642640046246 is an apocalyptic number.

642640046246 is a deficient number, since it is larger than the sum of its proper divisors (415916952922).

642640046246 is a wasteful number, since it uses less digits than its factorization.

642640046246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193449907.

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 642640046246 in words is "six hundred forty-two billion, six hundred forty million, forty-six thousand, two hundred forty-six".