66159944 has 8 divisors (see below), whose sum is σ = 124049910. Its totient is φ = 33079968.

The previous prime is 66159943. The next prime is 66159967. The reversal of 66159944 is 44995166.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 29702500 = 6038^2 + 5450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 66159895 and 66159904.

It is not an unprimeable number, because it can be changed into a prime (66159943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4134989 + ... + 4135004.

Almost surely, 2^66159944 is an apocalyptic number.

It is an amenable number.

66159944 is a deficient number, since it is larger than the sum of its proper divisors (57889966).

66159944 is a wasteful number, since it uses less digits than its factorization.

66159944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8269999 (or 8269995 counting only the distinct ones).

The product of its digits is 233280, while the sum is 44.

The square root of 66159944 is about 8133.8763206727. The cubic root of 66159944 is about 404.4501892630.

The spelling of 66159944 in words is "sixty-six million, one hundred fifty-nine thousand, nine hundred forty-four".