63666456 has 32 divisors (see below), whose sum is σ = 181904640. Its totient is φ = 18190368.

The previous prime is 63666437. The next prime is 63666469. The reversal of 63666456 is 65466636.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189316 + ... + 189651.

It is an arithmetic number, because the mean of its divisors is an integer number (5684520).

Almost surely, 2^63666456 is an apocalyptic number.

It is an amenable number.

63666456 is an abundant number, since it is smaller than the sum of its proper divisors (118238184).

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

63666456 is a wasteful number, since it uses less digits than its factorization.

63666456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378983 (or 378979 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 63666456 is about 7979.1262679569. The cubic root of 63666456 is about 399.3039060022.

The spelling of 63666456 in words is "sixty-three million, six hundred sixty-six thousand, four hundred fifty-six".