642047223853 has 4 divisors (see below), whose sum is σ = 733768255840. Its totient is φ = 550326191868.

The previous prime is 642047223799. The next prime is 642047223863. The reversal of 642047223853 is 358322740246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642047223853 - 2¹⁷ = 642047092781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642047223863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45860515983 + ... + 45860515996.

It is an arithmetic number, because the mean of its divisors is an integer number (183442063960).

Almost surely, 2^642047223853 is an apocalyptic number.

It is an amenable number.

642047223853 is a deficient number, since it is larger than the sum of its proper divisors (91721031987).

642047223853 is an equidigital number, since it uses as much as digits as its factorization.

642047223853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91721031986.

The product of its (nonzero) digits is 1935360, while the sum is 46.

The spelling of 642047223853 in words is "six hundred forty-two billion, forty-seven million, two hundred twenty-three thousand, eight hundred fifty-three".