72563981577 has 8 divisors (see below), whose sum is σ = 97608188064. Its totient is φ = 47947881408.

The previous prime is 72563981573. The next prime is 72563981603. The reversal of 72563981577 is 77518936527.

It is a happy number.

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

It is not a de Polignac number, because 72563981577 - 2² = 72563981573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72563981577.

It is not an unprimeable number, because it can be changed into a prime (72563981573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107026183 + ... + 107026860.

It is an arithmetic number, because the mean of its divisors is an integer number (12201023508).

Almost surely, 2^72563981577 is an apocalyptic number.

It is an amenable number.

72563981577 is a deficient number, since it is larger than the sum of its proper divisors (25044206487).

72563981577 is a wasteful number, since it uses less digits than its factorization.

72563981577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214053159.

The product of its digits is 22226400, while the sum is 60.

The spelling of 72563981577 in words is "seventy-two billion, five hundred sixty-three million, nine hundred eighty-one thousand, five hundred seventy-seven".