81002344601 has 4 divisors (see below), whose sum is σ = 81097307172. Its totient is φ = 80907382032.

The previous prime is 81002344571. The next prime is 81002344639. The reversal of 81002344601 is 10644320018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34508635225 + 46493709376 = 185765^2 + 215624^2 .

It is a cyclic number.

It is not a de Polignac number, because 81002344601 - 2¹⁸ = 81002082457 is a prime.

It is a super-2 number, since 2×81002344601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81002344001) 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, 47480006 + ... + 47481711.

It is an arithmetic number, because the mean of its divisors is an integer number (20274326793).

Almost surely, 2^81002344601 is an apocalyptic number.

It is an amenable number.

81002344601 is a deficient number, since it is larger than the sum of its proper divisors (94962571).

81002344601 is an equidigital number, since it uses as much as digits as its factorization.

81002344601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94962570.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 81002344601 its reverse (10644320018), we get a palindrome (91646664619).

The spelling of 81002344601 in words is "eighty-one billion, two million, three hundred forty-four thousand, six hundred one".