225498387981 has 4 divisors (see below), whose sum is σ = 300664517312. Its totient is φ = 150332258652.

The previous prime is 225498387977. The next prime is 225498388013. The reversal of 225498387981 is 189783894522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 225498387981 - 2² = 225498387977 is a prime.

It is a super-2 number, since 2×225498387981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225498387281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37583064661 + ... + 37583064666.

It is an arithmetic number, because the mean of its divisors is an integer number (75166129328).

Almost surely, 2^225498387981 is an apocalyptic number.

It is an amenable number.

225498387981 is a deficient number, since it is larger than the sum of its proper divisors (75166129331).

225498387981 is an equidigital number, since it uses as much as digits as its factorization.

225498387981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75166129330.

The product of its digits is 69672960, while the sum is 66.

The spelling of 225498387981 in words is "two hundred twenty-five billion, four hundred ninety-eight million, three hundred eighty-seven thousand, nine hundred eighty-one".