225918685901 has 2 divisors, whose sum is σ = 225918685902. Its totient is φ = 225918685900.

The previous prime is 225918685847. The next prime is 225918685919. The reversal of 225918685901 is 109586819522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122150949001 + 103767736900 = 349501^2 + 322130^2 .

It is a cyclic number.

It is not a de Polignac number, because 225918685901 - 2¹⁰ = 225918684877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225918685961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112959342950 + 112959342951.

It is an arithmetic number, because the mean of its divisors is an integer number (112959342951).

Almost surely, 2^225918685901 is an apocalyptic number.

It is an amenable number.

225918685901 is a deficient number, since it is larger than the sum of its proper divisors (1).

225918685901 is an equidigital number, since it uses as much as digits as its factorization.

225918685901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 225918685901 in words is "two hundred twenty-five billion, nine hundred eighteen million, six hundred eighty-five thousand, nine hundred one".