178857097225 has 27 divisors (see below), whose sum is σ = 227434316629. Its totient is φ = 139528116800.

The previous prime is 178857097207. The next prime is 178857097241. The reversal of 178857097225 is 522790758871.

The square root of 178857097225 is 422915.

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

It can be written as a sum of positive squares in 4 ways, for example, as 75283835641 + 103573261584 = 274379^2 + 321828^2 .

It is not a de Polignac number, because 178857097225 - 2¹⁵ = 178857064457 is a prime.

It is a super-2 number, since 2×178857097225² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 86696544 + ... + 86698606.

Almost surely, 2^178857097225 is an apocalyptic number.

178857097225 is the 422915-th square number.

178857097225 is the 211458-th centered octagonal number.

It is an amenable number.

178857097225 is a deficient number, since it is larger than the sum of its proper divisors (48577219404).

178857097225 is an frugal number, since it uses more digits than its factorization.

178857097225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 61.

The spelling of 178857097225 in words is "one hundred seventy-eight billion, eight hundred fifty-seven million, ninety-seven thousand, two hundred twenty-five".