642441424455 has 12 divisors (see below), whose sum is σ = 1113565135800. Its totient is φ = 342635426352.

The previous prime is 642441424451. The next prime is 642441424543. The reversal of 642441424455 is 554424144246.

642441424455 is a `hidden beast` number, since 64 + 2 + 4 + 4 + 142 + 445 + 5 = 666.

It is not a de Polignac number, because 642441424455 - 2² = 642441424451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14276476099 = 642441424455 / (6 + 4 + 2 + 4 + 4 + 1 + 4 + 2 + 4 + 4 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 642441424455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642441424451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7138238005 + ... + 7138238094.

It is an arithmetic number, because the mean of its divisors is an integer number (92797094650).

Almost surely, 2^642441424455 is an apocalyptic number.

642441424455 is a deficient number, since it is larger than the sum of its proper divisors (471123711345).

642441424455 is a wasteful number, since it uses less digits than its factorization.

642441424455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14276476110 (or 14276476107 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 45.

The spelling of 642441424455 in words is "six hundred forty-two billion, four hundred forty-one million, four hundred twenty-four thousand, four hundred fifty-five".