66704377 has 4 divisors (see below), whose sum is σ = 68507236. Its totient is φ = 64901520.

The previous prime is 66704371. The next prime is 66704387. The reversal of 66704377 is 77340766.

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 57395776 + 9308601 = 7576^2 + 3051^2 .

It is a cyclic number.

It is not a de Polignac number, because 66704377 - 2⁷ = 66704249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66704371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901374 + ... + 901447.

It is an arithmetic number, because the mean of its divisors is an integer number (17126809).

Almost surely, 2^66704377 is an apocalyptic number.

It is an amenable number.

66704377 is a deficient number, since it is larger than the sum of its proper divisors (1802859).

66704377 is a wasteful number, since it uses less digits than its factorization.

66704377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802858.

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 66704377 is about 8167.2747596735. The cubic root of 66704377 is about 405.5565725821.

It can be divided in two parts, 66704 and 377, that added together give a square (67081 = 259²).

The spelling of 66704377 in words is "sixty-six million, seven hundred four thousand, three hundred seventy-seven".