72561744019 has 8 divisors (see below), whose sum is σ = 72888380000. Its totient is φ = 72235193472.

The previous prime is 72561743981. The next prime is 72561744053. The reversal of 72561744019 is 91044716527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72561744019 - 2²¹ = 72559646867 is a prime.

It is a super-2 number, since 2×72561744019² (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 72561744019.

It is not an unprimeable number, because it can be changed into a prime (72561784019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2193202 + ... + 2226040.

It is an arithmetic number, because the mean of its divisors is an integer number (9111047500).

Almost surely, 2^72561744019 is an apocalyptic number.

72561744019 is the 155523-rd hex number.

72561744019 is a deficient number, since it is larger than the sum of its proper divisors (326635981).

72561744019 is a wasteful number, since it uses less digits than its factorization.

72561744019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42717.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 72561744019 in words is "seventy-two billion, five hundred sixty-one million, seven hundred forty-four thousand, nineteen".