173120636623551 has 4 divisors (see below), whose sum is σ = 230827515498072. Its totient is φ = 115413757749032.

The previous prime is 173120636623523. The next prime is 173120636623567. The reversal of 173120636623551 is 155326636021371.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 173120636623551 - 2²³ = 173120628234943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 173120636623494 and 173120636623503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173120636623951) 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, 28853439437256 + ... + 28853439437261.

It is an arithmetic number, because the mean of its divisors is an integer number (57706878874518).

Almost surely, 2^{173120636623551} is an apocalyptic number.

173120636623551 is a deficient number, since it is larger than the sum of its proper divisors (57706878874521).

173120636623551 is an equidigital number, since it uses as much as digits as its factorization.

173120636623551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57706878874520.

The product of its (nonzero) digits is 4082400, while the sum is 51.

The spelling of 173120636623551 in words is "one hundred seventy-three trillion, one hundred twenty billion, six hundred thirty-six million, six hundred twenty-three thousand, five hundred fifty-one".