66624646 has 16 divisors (see below), whose sum is σ = 109811520. Its totient is φ = 30064680.

The previous prime is 66624641. The next prime is 66624653. The reversal of 66624646 is 64642666.

It is a junction number, because it is equal to n+sod(n) for n = 66624599 and 66624608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66624641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7836 + ... + 13951.

It is an arithmetic number, because the mean of its divisors is an integer number (6863220).

Almost surely, 2^66624646 is an apocalyptic number.

66624646 is a deficient number, since it is larger than the sum of its proper divisors (43186874).

66624646 is a wasteful number, since it uses less digits than its factorization.

66624646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21939.

The product of its digits is 248832, while the sum is 40.

The square root of 66624646 is about 8162.3921738667. The cubic root of 66624646 is about 405.3949224051.

The spelling of 66624646 in words is "sixty-six million, six hundred twenty-four thousand, six hundred forty-six".