172218558351541 has 4 divisors (see below), whose sum is σ = 185466139763212. Its totient is φ = 158970976939872.

The previous prime is 172218558351527. The next prime is 172218558351601. The reversal of 172218558351541 is 145153855812271.

172218558351541 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.

It can be written as a sum of positive squares in 2 ways, for example, as 53438073718225 + 118780484633316 = 7310135^2 + 10898646^2 .

It is a cyclic number.

It is not a de Polignac number, because 172218558351541 - 2⁵ = 172218558351509 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 (172218558357541) 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, 6623790705816 + ... + 6623790705841.

It is an arithmetic number, because the mean of its divisors is an integer number (46366534940803).

Almost surely, 2^{172218558351541} is an apocalyptic number.

It is an amenable number.

172218558351541 is a deficient number, since it is larger than the sum of its proper divisors (13247581411671).

172218558351541 is a wasteful number, since it uses less digits than its factorization.

172218558351541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13247581411670.

The product of its digits is 13440000, while the sum is 58.

The spelling of 172218558351541 in words is "one hundred seventy-two trillion, two hundred eighteen billion, five hundred fifty-eight million, three hundred fifty-one thousand, five hundred forty-one".