642441401823 has 16 divisors (see below), whose sum is σ = 954289617120. Its totient is φ = 381715845504.

The previous prime is 642441401801. The next prime is 642441401827. The reversal of 642441401823 is 328104144246.

It is not a de Polignac number, because 642441401823 - 2¹² = 642441397727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642441401827) 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, 284013636 + ... + 284015897.

It is an arithmetic number, because the mean of its divisors is an integer number (59643101070).

Almost surely, 2^642441401823 is an apocalyptic number.

642441401823 is a deficient number, since it is larger than the sum of its proper divisors (311848215297).

642441401823 is a wasteful number, since it uses less digits than its factorization.

642441401823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568029578.

The product of its (nonzero) digits is 147456, while the sum is 39.

The spelling of 642441401823 in words is "six hundred forty-two billion, four hundred forty-one million, four hundred one thousand, eight hundred twenty-three".