225661545445240 has 128 divisors (see below), whose sum is σ = 526343103000000. Its totient is φ = 86970165968896.

The previous prime is 225661545445201. The next prime is 225661545445249. The reversal of 225661545445240 is 42544545166522.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225661545445249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6216724611 + ... + 6216760909.

Almost surely, 2^{225661545445240} is an apocalyptic number.

225661545445240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225661545445240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263171551500000).

225661545445240 is an abundant number, since it is smaller than the sum of its proper divisors (300681557554760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225661545445240 is a wasteful number, since it uses less digits than its factorization.

225661545445240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47377 (or 47373 counting only the distinct ones).

The product of its (nonzero) digits is 46080000, while the sum is 55.

The spelling of 225661545445240 in words is "two hundred twenty-five trillion, six hundred sixty-one billion, five hundred forty-five million, four hundred forty-five thousand, two hundred forty".