172236143226018 has 64 divisors (see below), whose sum is σ = 355018598887680. Its totient is φ = 55671408844800.

The previous prime is 172236143226013. The next prime is 172236143226031. The reversal of 172236143226018 is 810622341632271.

It is not an unprimeable number, because it can be changed into a prime (172236143226013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 477233538 + ... + 477594306.

It is an arithmetic number, because the mean of its divisors is an integer number (5547165607620).

Almost surely, 2^{172236143226018} is an apocalyptic number.

172236143226018 is an abundant number, since it is smaller than the sum of its proper divisors (182782455661662).

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

172236143226018 is a wasteful number, since it uses less digits than its factorization.

172236143226018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372603.

The product of its (nonzero) digits is 1161216, while the sum is 48.

Adding to 172236143226018 its reverse (810622341632271), we get a palindrome (982858484858289).

The spelling of 172236143226018 in words is "one hundred seventy-two trillion, two hundred thirty-six billion, one hundred forty-three million, two hundred twenty-six thousand, eighteen".