72534843553 has 4 divisors (see below), whose sum is σ = 74874677248. Its totient is φ = 70195009860.

The previous prime is 72534843547. The next prime is 72534843569. The reversal of 72534843553 is 35534843527.

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 72534843553 - 2²¹ = 72532746401 is a prime.

It is a super-2 number, since 2×72534843553² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72534843497 and 72534843506.

It is not an unprimeable number, because it can be changed into a prime (72534843503) 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, 1169916801 + ... + 1169916862.

It is an arithmetic number, because the mean of its divisors is an integer number (18718669312).

Almost surely, 2^72534843553 is an apocalyptic number.

It is an amenable number.

72534843553 is a deficient number, since it is larger than the sum of its proper divisors (2339833695).

72534843553 is a wasteful number, since it uses less digits than its factorization.

72534843553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339833694.

The product of its digits is 6048000, while the sum is 49.

The spelling of 72534843553 in words is "seventy-two billion, five hundred thirty-four million, eight hundred forty-three thousand, five hundred fifty-three".