72351641689 has 4 divisors (see below), whose sum is σ = 72436462756. Its totient is φ = 72266820624.

The previous prime is 72351641633. The next prime is 72351641693. The reversal of 72351641689 is 98614615327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98614615327 = 269 ⋅366597083.

It can be written as a sum of positive squares in 2 ways, for example, as 37581699600 + 34769942089 = 193860^2 + 186467^2 .

It is a cyclic number.

It is not a de Polignac number, because 72351641689 - 2³¹ = 70204158041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72351641629) 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, 42409254 + ... + 42410959.

It is an arithmetic number, because the mean of its divisors is an integer number (18109115689).

Almost surely, 2^72351641689 is an apocalyptic number.

It is an amenable number.

72351641689 is a deficient number, since it is larger than the sum of its proper divisors (84821067).

72351641689 is an equidigital number, since it uses as much as digits as its factorization.

72351641689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84821066.

The product of its digits is 2177280, while the sum is 52.

The spelling of 72351641689 in words is "seventy-two billion, three hundred fifty-one million, six hundred forty-one thousand, six hundred eighty-nine".