147244821681 has 4 divisors (see below), whose sum is σ = 196326428912. Its totient is φ = 98163214452.

The previous prime is 147244821679. The next prime is 147244821793. The reversal of 147244821681 is 186128442741.

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 not a de Polignac number, because 147244821681 - 2¹ = 147244821679 is a prime.

It is a super-2 number, since 2×147244821681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 147244821681.

It is not an unprimeable number, because it can be changed into a prime (147244801681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24540803611 + ... + 24540803616.

It is an arithmetic number, because the mean of its divisors is an integer number (49081607228).

Almost surely, 2^147244821681 is an apocalyptic number.

It is an amenable number.

147244821681 is a deficient number, since it is larger than the sum of its proper divisors (49081607231).

147244821681 is an equidigital number, since it uses as much as digits as its factorization.

147244821681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49081607230.

The product of its digits is 688128, while the sum is 48.

The spelling of 147244821681 in words is "one hundred forty-seven billion, two hundred forty-four million, eight hundred twenty-one thousand, six hundred eighty-one".