66776741 has 4 divisors (see below), whose sum is σ = 68405484. Its totient is φ = 65148000.

The previous prime is 66776719. The next prime is 66776753. The reversal of 66776741 is 14767766.

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 36844900 + 29931841 = 6070^2 + 5471^2 .

It is a cyclic number.

It is not a de Polignac number, because 66776741 - 2¹⁰ = 66775717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66776692 and 66776701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66776791) 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, 814310 + ... + 814391.

It is an arithmetic number, because the mean of its divisors is an integer number (17101371).

Almost surely, 2^66776741 is an apocalyptic number.

It is an amenable number.

66776741 is a deficient number, since it is larger than the sum of its proper divisors (1628743).

66776741 is a wasteful number, since it uses less digits than its factorization.

66776741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628742.

The product of its digits is 296352, while the sum is 44.

The square root of 66776741 is about 8171.7036779364. The cubic root of 66776741 is about 405.7031751038.

The spelling of 66776741 in words is "sixty-six million, seven hundred seventy-six thousand, seven hundred forty-one".