642465208268 has 48 divisors (see below), whose sum is σ = 1217486805696. Its totient is φ = 294885826560.

The previous prime is 642465208261. The next prime is 642465208303. The reversal of 642465208268 is 862802564246.

It is not an unprimeable number, because it can be changed into a prime (642465208261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35227280 + ... + 35245512.

It is an arithmetic number, because the mean of its divisors is an integer number (25364308452).

Almost surely, 2^642465208268 is an apocalyptic number.

It is an amenable number.

642465208268 is a deficient number, since it is larger than the sum of its proper divisors (575021597428).

642465208268 is a wasteful number, since it uses less digits than its factorization.

642465208268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21954 (or 21952 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 53.

The spelling of 642465208268 in words is "six hundred forty-two billion, four hundred sixty-five million, two hundred eight thousand, two hundred sixty-eight".