66960791 has 4 divisors (see below), whose sum is σ = 66977784. Its totient is φ = 66943800.

The previous prime is 66960767. The next prime is 66960793. The reversal of 66960791 is 19706966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19706966 = 2 ⋅9853483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66960791 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 (66960793) 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, 821 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (16744446).

Almost surely, 2^66960791 is an apocalyptic number.

66960791 is a deficient number, since it is larger than the sum of its proper divisors (16993).

66960791 is a wasteful number, since it uses less digits than its factorization.

66960791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16992.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 66960791 is about 8182.9573504938. The cubic root of 66960791 is about 406.0755661071.

The spelling of 66960791 in words is "sixty-six million, nine hundred sixty thousand, seven hundred ninety-one".