66977741 has 4 divisors (see below), whose sum is σ = 67002684. Its totient is φ = 66952800.

The previous prime is 66977731. The next prime is 66977753. The reversal of 66977741 is 14777966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29106025 + 37871716 = 5395^2 + 6154^2 .

It is a cyclic number.

It is not a de Polignac number, because 66977741 - 2¹⁰ = 66976717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66977731) 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, 7880 + ... + 14001.

It is an arithmetic number, because the mean of its divisors is an integer number (16750671).

Almost surely, 2^66977741 is an apocalyptic number.

It is an amenable number.

66977741 is a deficient number, since it is larger than the sum of its proper divisors (24943).

66977741 is a wasteful number, since it uses less digits than its factorization.

66977741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24942.

The product of its digits is 444528, while the sum is 47.

The square root of 66977741 is about 8183.9929740928. The cubic root of 66977741 is about 406.1098269537.

The spelling of 66977741 in words is "sixty-six million, nine hundred seventy-seven thousand, seven hundred forty-one".