66590644 has 12 divisors (see below), whose sum is σ = 116593344. Its totient is φ = 33278264.

The previous prime is 66590621. The next prime is 66590659. The reversal of 66590644 is 44609566.

It is a junction number, because it is equal to n+sod(n) for n = 66590597 and 66590606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9339 + ... + 14845.

It is an arithmetic number, because the mean of its divisors is an integer number (9716112).

Almost surely, 2^66590644 is an apocalyptic number.

It is an amenable number.

66590644 is a deficient number, since it is larger than the sum of its proper divisors (50002700).

66590644 is a wasteful number, since it uses less digits than its factorization.

66590644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8534 (or 8532 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 66590644 is about 8160.3090627745. The cubic root of 66590644 is about 405.3259460099.

The spelling of 66590644 in words is "sixty-six million, five hundred ninety thousand, six hundred forty-four".