66533777 has 8 divisors (see below), whose sum is σ = 67818816. Its totient is φ = 65261232.

The previous prime is 66533749. The next prime is 66533783. The reversal of 66533777 is 77733566.

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 66533777 - 2¹⁸ = 66271633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66533707) 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, 8003 + ... + 14039.

It is an arithmetic number, because the mean of its divisors is an integer number (8477352).

Almost surely, 2^66533777 is an apocalyptic number.

It is an amenable number.

66533777 is a deficient number, since it is larger than the sum of its proper divisors (1285039).

66533777 is a wasteful number, since it uses less digits than its factorization.

66533777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6247.

The product of its digits is 555660, while the sum is 44.

The square root of 66533777 is about 8156.8239529856. The cubic root of 66533777 is about 405.2105332251.

The spelling of 66533777 in words is "sixty-six million, five hundred thirty-three thousand, seven hundred seventy-seven".