642645412402 has 24 divisors (see below), whose sum is σ = 1180369128240. Its totient is φ = 260923700520.

The previous prime is 642645412379. The next prime is 642645412403. The reversal of 642645412402 is 204214546246.

It is a super-3 number, since 3×642645412402³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (642645412403) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 172566724 + ... + 172570447.

It is an arithmetic number, because the mean of its divisors is an integer number (49182047010).

Almost surely, 2^642645412402 is an apocalyptic number.

642645412402 is a deficient number, since it is larger than the sum of its proper divisors (537723715838).

642645412402 is a wasteful number, since it uses less digits than its factorization.

642645412402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345137206 (or 345137199 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 40.

Adding to 642645412402 its reverse (204214546246), we get a palindrome (846859958648).

The spelling of 642645412402 in words is "six hundred forty-two billion, six hundred forty-five million, four hundred twelve thousand, four hundred two".