225661279870 has 32 divisors (see below), whose sum is σ = 449258308128. Its totient is φ = 81069164928.

The previous prime is 225661279853. The next prime is 225661279897. The reversal of 225661279870 is 78972166522.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 23452704 + ... + 23462323.

It is an arithmetic number, because the mean of its divisors is an integer number (14039322129).

Almost surely, 2^225661279870 is an apocalyptic number.

225661279870 is a deficient number, since it is larger than the sum of its proper divisors (223597028258).

225661279870 is a wasteful number, since it uses less digits than its factorization.

225661279870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46915084.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 225661279870 in words is "two hundred twenty-five billion, six hundred sixty-one million, two hundred seventy-nine thousand, eight hundred seventy".