172721860880523 has 8 divisors (see below), whose sum is σ = 230557217251536. Its totient is φ = 115017205881600.

The previous prime is 172721860880521. The next prime is 172721860880531. The reversal of 172721860880523 is 325088068127271.

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

It is not a de Polignac number, because 172721860880523 - 2¹ = 172721860880521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172721860880521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32675339938 + ... + 32675345223.

It is an arithmetic number, because the mean of its divisors is an integer number (28819652156442).

Almost surely, 2^{172721860880523} is an apocalyptic number.

172721860880523 is a deficient number, since it is larger than the sum of its proper divisors (57835356371013).

172721860880523 is an equidigital number, since it uses as much as digits as its factorization.

172721860880523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65350686045.

The product of its (nonzero) digits is 18063360, while the sum is 60.

The spelling of 172721860880523 in words is "one hundred seventy-two trillion, seven hundred twenty-one billion, eight hundred sixty million, eight hundred eighty thousand, five hundred twenty-three".