66550844 has 24 divisors (see below), whose sum is σ = 122950800. Its totient is φ = 31432320.

The previous prime is 66550843. The next prime is 66550859. The reversal of 66550844 is 44805566.

It is a super-2 number, since 2×66550844² = 8858029674224672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 66550798 and 66550807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550843) 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, 30014 + ... + 32154.

It is an arithmetic number, because the mean of its divisors is an integer number (5122950).

Almost surely, 2^66550844 is an apocalyptic number.

It is an amenable number.

66550844 is a deficient number, since it is larger than the sum of its proper divisors (56399956).

66550844 is a wasteful number, since it uses less digits than its factorization.

66550844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2571 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 66550844 is about 8157.8700651579. The cubic root of 66550844 is about 405.2451779686.

The spelling of 66550844 in words is "sixty-six million, five hundred fifty thousand, eight hundred forty-four".