72520305505 has 8 divisors (see below), whose sum is σ = 87030661824. Its totient is φ = 58012047600.

The previous prime is 72520305497. The next prime is 72520305511. The reversal of 72520305505 is 50550302527.

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

It is not a de Polignac number, because 72520305505 - 2³ = 72520305497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447541 + ... + 587650.

It is an arithmetic number, because the mean of its divisors is an integer number (10878832728).

Almost surely, 2^72520305505 is an apocalyptic number.

It is an amenable number.

72520305505 is a deficient number, since it is larger than the sum of its proper divisors (14510356319).

72520305505 is a wasteful number, since it uses less digits than its factorization.

72520305505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049207.

The product of its (nonzero) digits is 52500, while the sum is 34.

The spelling of 72520305505 in words is "seventy-two billion, five hundred twenty million, three hundred five thousand, five hundred five".