66545667 has 12 divisors (see below), whose sum is σ = 101775960. Its totient is φ = 41754048.

The previous prime is 66545663. The next prime is 66545671. The reversal of 66545667 is 76654566.

It is an interprime number because it is at equal distance from previous prime (66545663) and next prime (66545671).

It is not a de Polignac number, because 66545667 - 2² = 66545663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66545663) 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, 217317 + ... + 217622.

It is an arithmetic number, because the mean of its divisors is an integer number (8481330).

Almost surely, 2^66545667 is an apocalyptic number.

66545667 is a deficient number, since it is larger than the sum of its proper divisors (35230293).

66545667 is a wasteful number, since it uses less digits than its factorization.

66545667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434962 (or 434959 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 66545667 is about 8157.5527580274. The cubic root of 66545667 is about 405.2346696687.

It can be divided in two parts, 6654 and 5667, that added together give a palindrome (12321).

The spelling of 66545667 in words is "sixty-six million, five hundred forty-five thousand, six hundred sixty-seven".