66941971 has 8 divisors (see below), whose sum is σ = 72609264. Its totient is φ = 61466880.

The previous prime is 66941969. The next prime is 66941999. The reversal of 66941971 is 17914966.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66941971 - 2¹ = 66941969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66941071) 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, 47325 + ... + 48718.

It is an arithmetic number, because the mean of its divisors is an integer number (9076158).

Almost surely, 2^66941971 is an apocalyptic number.

66941971 is a deficient number, since it is larger than the sum of its proper divisors (5667293).

66941971 is a wasteful number, since it uses less digits than its factorization.

66941971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96101.

The product of its digits is 81648, while the sum is 43.

The square root of 66941971 is about 8181.8073186797. The cubic root of 66941971 is about 406.0375186760.

The spelling of 66941971 in words is "sixty-six million, nine hundred forty-one thousand, nine hundred seventy-one".