655120521173 has 4 divisors (see below), whose sum is σ = 666224258880. Its totient is φ = 644016783468.

The previous prime is 655120521157. The next prime is 655120521191. The reversal of 655120521173 is 371125021556.

655120521173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 655120521173 - 2⁴ = 655120521157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655120521193) 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, 5551868765 + ... + 5551868882.

It is an arithmetic number, because the mean of its divisors is an integer number (166556064720).

Almost surely, 2^655120521173 is an apocalyptic number.

It is an amenable number.

655120521173 is a deficient number, since it is larger than the sum of its proper divisors (11103737707).

655120521173 is a wasteful number, since it uses less digits than its factorization.

655120521173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11103737706.

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 655120521173 in words is "six hundred fifty-five billion, one hundred twenty million, five hundred twenty-one thousand, one hundred seventy-three".