172218558351540 has 48 divisors (see below), whose sum is σ = 482212725809472. Its totient is φ = 45924876281856.

The previous prime is 172218558351527. The next prime is 172218558351601. The reversal of 172218558351540 is 45153855812271.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43687707 + ... + 47466333.

It is an arithmetic number, because the mean of its divisors is an integer number (10046098454364).

Almost surely, 2^{172218558351540} is an apocalyptic number.

172218558351540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172218558351540 is an abundant number, since it is smaller than the sum of its proper divisors (309994167457932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172218558351540 is a wasteful number, since it uses less digits than its factorization.

172218558351540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538256 (or 4538254 counting only the distinct ones).

The product of its (nonzero) digits is 13440000, while the sum is 57.

The spelling of 172218558351540 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".