66404377 has 16 divisors (see below), whose sum is σ = 73100160. Its totient is φ = 59951232.

The previous prime is 66404353. The next prime is 66404419. The reversal of 66404377 is 77340466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66404377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66404347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158274 + ... + 158692.

It is an arithmetic number, because the mean of its divisors is an integer number (4568760).

Almost surely, 2^66404377 is an apocalyptic number.

It is an amenable number.

66404377 is a deficient number, since it is larger than the sum of its proper divisors (6695783).

66404377 is a wasteful number, since it uses less digits than its factorization.

66404377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 66404377 is about 8148.8880836590. Note that the first 3 decimals coincide. The cubic root of 66404377 is about 404.9476678813.

The spelling of 66404377 in words is "sixty-six million, four hundred four thousand, three hundred seventy-seven".