225054721661 has 16 divisors (see below), whose sum is σ = 289638924288. Its totient is φ = 169710303600.

The previous prime is 225054721637. The next prime is 225054721667. The reversal of 225054721661 is 166127450522.

It is a cyclic number.

It is not a de Polignac number, because 225054721661 - 2⁶ = 225054721597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225054721667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47139365 + ... + 47144138.

It is an arithmetic number, because the mean of its divisors is an integer number (18102432768).

Almost surely, 2^225054721661 is an apocalyptic number.

It is an amenable number.

225054721661 is a deficient number, since it is larger than the sum of its proper divisors (64584202627).

225054721661 is a wasteful number, since it uses less digits than its factorization.

225054721661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94283552.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 225054721661 in words is "two hundred twenty-five billion, fifty-four million, seven hundred twenty-one thousand, six hundred sixty-one".