72553879883521 has 4 divisors (see below), whose sum is σ = 72555594215472. Its totient is φ = 72552165551572.

The previous prime is 72553879883509. The next prime is 72553879883531. The reversal of 72553879883521 is 12538897835527.

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 72553879883521 - 2⁷ = 72553879883393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72553879883531) 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, 857102491 + ... + 857187136.

It is an arithmetic number, because the mean of its divisors is an integer number (18138898553868).

Almost surely, 2^{72553879883521} is an apocalyptic number.

It is an amenable number.

72553879883521 is a deficient number, since it is larger than the sum of its proper divisors (1714331951).

72553879883521 is a wasteful number, since it uses less digits than its factorization.

72553879883521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714331950.

The product of its digits is 1016064000, while the sum is 73.

The spelling of 72553879883521 in words is "seventy-two trillion, five hundred fifty-three billion, eight hundred seventy-nine million, eight hundred eighty-three thousand, five hundred twenty-one".