2173958569225 has 9 divisors (see below), whose sum is σ = 2695717767367. Its totient is φ = 1739160957640.

The previous prime is 2173958569219. The next prime is 2173958569253. The reversal of 2173958569225 is 5229658593712.

The square root of 2173958569225 is 1474435.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 782625084921 + 1391333484304 = 884661^2 + 1179548^2 .

It is not a de Polignac number, because 2173958569225 - 2¹⁵ = 2173958536457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7224732 + ... + 7519618.

Almost surely, 2^{2173958569225} is an apocalyptic number.

2173958569225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2173958569225 is the 1474435-th square number.

2173958569225 is the 737218-th centered octagonal number.

It is an amenable number.

2173958569225 is a deficient number, since it is larger than the sum of its proper divisors (521759198142).

2173958569225 is an frugal number, since it uses more digits than its factorization.

2173958569225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589784 (or 294892 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 64.

Multiplying 2173958569225 by its sum of digits (64), we get a square (139133348430400 = 11795480²).

The spelling of 2173958569225 in words is "two trillion, one hundred seventy-three billion, nine hundred fifty-eight million, five hundred sixty-nine thousand, two hundred twenty-five".