66442442420 has 24 divisors (see below), whose sum is σ = 139844111904. Its totient is φ = 26516980256.

The previous prime is 66442442393. The next prime is 66442442431. The reversal of 66442442420 is 2424424466.

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, 3740714 + ... + 3758433.

It is an arithmetic number, because the mean of its divisors is an integer number (5826837996).

Almost surely, 2^66442442420 is an apocalyptic number.

It is an amenable number.

66442442420 is an abundant number, since it is smaller than the sum of its proper divisors (73401669484).

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

66442442420 is a wasteful number, since it uses less digits than its factorization.

66442442420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7499599 (or 7499597 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 38.

Adding to 66442442420 its reverse (2424424466), we get a palindrome (68866866886).

The spelling of 66442442420 in words is "sixty-six billion, four hundred forty-two million, four hundred forty-two thousand, four hundred twenty".