66977743 has 8 divisors (see below), whose sum is σ = 77990688. Its totient is φ = 56325984.

The previous prime is 66977731. The next prime is 66977753. The reversal of 66977743 is 34777966.

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 66977743 - 2²⁵ = 33423311 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 (66977753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89896 + ... + 90637.

It is an arithmetic number, because the mean of its divisors is an integer number (9748836).

Almost surely, 2^66977743 is an apocalyptic number.

66977743 is a deficient number, since it is larger than the sum of its proper divisors (11012945).

66977743 is a wasteful number, since it uses less digits than its factorization.

66977743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180593.

The product of its digits is 1333584, while the sum is 49.

The square root of 66977743 is about 8183.9930962825. The cubic root of 66977743 is about 406.1098309959.

The spelling of 66977743 in words is "sixty-six million, nine hundred seventy-seven thousand, seven hundred forty-three".