478355661 has 24 divisors (see below), whose sum is σ = 792044864. Its totient is φ = 272522880.

The previous prime is 478355627. The next prime is 478355663. The reversal of 478355661 is 166553874.

478355661 is a `hidden beast` number, since 4 + 7 + 83 + 5 + 566 + 1 = 666.

It is not a de Polignac number, because 478355661 - 2²⁷ = 344137933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478355663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9966 + ... + 32496.

Almost surely, 2^478355661 is an apocalyptic number.

It is an amenable number.

478355661 is a deficient number, since it is larger than the sum of its proper divisors (313689203).

478355661 is a wasteful number, since it uses less digits than its factorization.

478355661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22881 (or 22878 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 478355661 is about 21871.3433743792. The cubic root of 478355661 is about 782.0784262324.

The spelling of 478355661 in words is "four hundred seventy-eight million, three hundred fifty-five thousand, six hundred sixty-one".