66975941 has 4 divisors (see below), whose sum is σ = 68239692. Its totient is φ = 65712192.

The previous prime is 66975929. The next prime is 66975943. The reversal of 66975941 is 14957966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14957966 = 2 ⋅7478983.

It can be written as a sum of positive squares in 2 ways, for example, as 58967041 + 8008900 = 7679^2 + 2830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66975941 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631796 + ... + 631901.

It is an arithmetic number, because the mean of its divisors is an integer number (17059923).

Almost surely, 2^66975941 is an apocalyptic number.

It is an amenable number.

66975941 is a deficient number, since it is larger than the sum of its proper divisors (1263751).

66975941 is a wasteful number, since it uses less digits than its factorization.

66975941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263750.

The product of its digits is 408240, while the sum is 47.

The square root of 66975941 is about 8183.8830025850. The cubic root of 66975941 is about 406.1061889080.

The spelling of 66975941 in words is "sixty-six million, nine hundred seventy-five thousand, nine hundred forty-one".