66536648 has 16 divisors (see below), whose sum is σ = 124848000. Its totient is φ = 33243856.

The previous prime is 66536647. The next prime is 66536669. The reversal of 66536648 is 84663566.

It is a Cunningham number, because it is equal to 8157²-1.

It is a junction number, because it is equal to n+sod(n) for n = 66536599 and 66536608.

It is not an unprimeable number, because it can be changed into a prime (66536647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14273 + ... + 18351.

It is an arithmetic number, because the mean of its divisors is an integer number (7803000).

Almost surely, 2^66536648 is an apocalyptic number.

It is an amenable number.

66536648 is a deficient number, since it is larger than the sum of its proper divisors (58311352).

66536648 is a wasteful number, since it uses less digits than its factorization.

66536648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124 (or 6120 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 66536648 is about 8156.9999387030. Note that the first 4 decimals coincide. The cubic root of 66536648 is about 405.2163615565.

The spelling of 66536648 in words is "sixty-six million, five hundred thirty-six thousand, six hundred forty-eight".