427217661 has 24 divisors (see below), whose sum is σ = 674492000. Its totient is φ = 258974496.

The previous prime is 427217657. The next prime is 427217669. The reversal of 427217661 is 166712724.

427217661 is a `hidden beast` number, since 427 + 2 + 176 + 61 = 666.

It is not a de Polignac number, because 427217661 - 2² = 427217657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427217669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19411 + ... + 35088.

Almost surely, 2^427217661 is an apocalyptic number.

It is an amenable number.

427217661 is a deficient number, since it is larger than the sum of its proper divisors (247274339).

427217661 is a wasteful number, since it uses less digits than its factorization.

427217661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54585 (or 54582 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 427217661 is about 20669.2443258093. The cubic root of 427217661 is about 753.1527496556.

The spelling of 427217661 in words is "four hundred twenty-seven million, two hundred seventeen thousand, six hundred sixty-one".