225721172650 has 48 divisors (see below), whose sum is σ = 441561881088. Its totient is φ = 85727304000.

The previous prime is 225721172603. The next prime is 225721172659. The reversal of 225721172650 is 56271127522.

It is a super-2 number, since 2×225721172650² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (225721172659) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1291686 + ... + 1455985.

It is an arithmetic number, because the mean of its divisors is an integer number (9199205856).

Almost surely, 2^225721172650 is an apocalyptic number.

225721172650 is a deficient number, since it is larger than the sum of its proper divisors (215840708438).

225721172650 is a wasteful number, since it uses less digits than its factorization.

225721172650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747767 (or 2747762 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 225721172650 in words is "two hundred twenty-five billion, seven hundred twenty-one million, one hundred seventy-two thousand, six hundred fifty".