642454103205 has 32 divisors (see below), whose sum is σ = 1143286444800. Its totient is φ = 342298443456.

The previous prime is 642454103201. The next prime is 642454103237. The reversal of 642454103205 is 502301454246.

642454103205 is a `hidden beast` number, since 64 + 24 + 541 + 0 + 32 + 0 + 5 = 666.

It is not a de Polignac number, because 642454103205 - 2² = 642454103201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642454103205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642454103201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2252025 + ... + 2521214.

It is an arithmetic number, because the mean of its divisors is an integer number (35727701400).

Almost surely, 2^642454103205 is an apocalyptic number.

It is an amenable number.

642454103205 is a deficient number, since it is larger than the sum of its proper divisors (500832341595).

642454103205 is a wasteful number, since it uses less digits than its factorization.

642454103205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774250 (or 4774244 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 642454103205 in words is "six hundred forty-two billion, four hundred fifty-four million, one hundred three thousand, two hundred five".