66975944 has 24 divisors (see below), whose sum is σ = 146083590. Its totient is φ = 28703808.

The previous prime is 66975943. The next prime is 66975949. The reversal of 66975944 is 44957966.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 26399044 = 6370^2 + 5138^2 .

It is a super-2 number, since 2×66975944² = 8971554149382272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66975892 and 66975901.

It is not an unprimeable number, because it can be changed into a prime (66975943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85037 + ... + 85820.

Almost surely, 2^66975944 is an apocalyptic number.

It is an amenable number.

66975944 is an abundant number, since it is smaller than the sum of its proper divisors (79107646).

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

66975944 is a wasteful number, since it uses less digits than its factorization.

66975944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170877 (or 170866 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 50.

The square root of 66975944 is about 8183.8831858721. The cubic root of 66975944 is about 406.1061949715.

The spelling of 66975944 in words is "sixty-six million, nine hundred seventy-five thousand, nine hundred forty-four".