245209172172 has 12 divisors (see below), whose sum is σ = 572154735096. Its totient is φ = 81736390720.

The previous prime is 245209172171. The next prime is 245209172183. The reversal of 245209172172 is 271271902542.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (245209172171) 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, 10217048829 + ... + 10217048852.

It is an arithmetic number, because the mean of its divisors is an integer number (47679561258).

Almost surely, 2^245209172172 is an apocalyptic number.

It is an amenable number.

245209172172 is an abundant number, since it is smaller than the sum of its proper divisors (326945562924).

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

245209172172 is a wasteful number, since it uses less digits than its factorization.

245209172172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20434097688 (or 20434097686 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 245209172172 in words is "two hundred forty-five billion, two hundred nine million, one hundred seventy-two thousand, one hundred seventy-two".