665172413225 has 6 divisors (see below), whose sum is σ = 824813792430. Its totient is φ = 532137930560.

The previous prime is 665172413209. The next prime is 665172413237. The reversal of 665172413225 is 522314271566.

It can be written as a sum of positive squares in 3 ways, for example, as 9765590041 + 655406823184 = 98821^2 + 809572^2 .

It is not a de Polignac number, because 665172413225 - 2⁴ = 665172413209 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 13303448240 + ... + 13303448289.

It is an arithmetic number, because the mean of its divisors is an integer number (137468965405).

Almost surely, 2^665172413225 is an apocalyptic number.

It is an amenable number.

665172413225 is a deficient number, since it is larger than the sum of its proper divisors (159641379205).

665172413225 is a wasteful number, since it uses less digits than its factorization.

665172413225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26606896539 (or 26606896534 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

It can be divided in two parts, 66517 and 2413225, that added together give a palindrome (2479742).

The spelling of 665172413225 in words is "six hundred sixty-five billion, one hundred seventy-two million, four hundred thirteen thousand, two hundred twenty-five".