442148765821 has 4 divisors (see below), whose sum is σ = 505312875232. Its totient is φ = 378984656412.

The previous prime is 442148765819. The next prime is 442148765869. The reversal of 442148765821 is 128567841244.

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 442148765821 - 2¹ = 442148765819 is a prime.

It is a super-2 number, since 2×442148765821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442148768821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31582054695 + ... + 31582054708.

It is an arithmetic number, because the mean of its divisors is an integer number (126328218808).

Almost surely, 2^442148765821 is an apocalyptic number.

It is an amenable number.

442148765821 is a deficient number, since it is larger than the sum of its proper divisors (63164109411).

442148765821 is an equidigital number, since it uses as much as digits as its factorization.

442148765821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63164109410.

The product of its digits is 3440640, while the sum is 52.

The spelling of 442148765821 in words is "four hundred forty-two billion, one hundred forty-eight million, seven hundred sixty-five thousand, eight hundred twenty-one".