66408377 has 12 divisors (see below), whose sum is σ = 79340580. Its totient is φ = 55381536.

The previous prime is 66408371. The next prime is 66408389. The reversal of 66408377 is 77380466.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 5271616 = 7819^2 + 2296^2 .

It is not a de Polignac number, because 66408377 - 2⁴ = 66408361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66408371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16502 + ... + 20127.

It is an arithmetic number, because the mean of its divisors is an integer number (6611715).

Almost surely, 2^66408377 is an apocalyptic number.

It is an amenable number.

66408377 is a deficient number, since it is larger than the sum of its proper divisors (12932203).

66408377 is a wasteful number, since it uses less digits than its factorization.

66408377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36680 (or 36673 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 66408377 is about 8149.1335122208. The cubic root of 66408377 is about 404.9557986613.

The spelling of 66408377 in words is "sixty-six million, four hundred eight thousand, three hundred seventy-seven".