225861409157 has 4 divisors (see below), whose sum is σ = 225893421516. Its totient is φ = 225829396800.

The previous prime is 225861409139. The next prime is 225861409177. The reversal of 225861409157 is 751904168522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204146734276 + 21714674881 = 451826^2 + 147359^2 .

It is a cyclic number.

It is not a de Polignac number, because 225861409157 - 2⁶ = 225861409093 is a prime.

It is a super-2 number, since 2×225861409157² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225861409177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15995594 + ... + 16009707.

It is an arithmetic number, because the mean of its divisors is an integer number (56473355379).

Almost surely, 2^225861409157 is an apocalyptic number.

It is an amenable number.

225861409157 is a deficient number, since it is larger than the sum of its proper divisors (32012359).

225861409157 is an equidigital number, since it uses as much as digits as its factorization.

225861409157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32012358.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 225861409157 in words is "two hundred twenty-five billion, eight hundred sixty-one million, four hundred nine thousand, one hundred fifty-seven".