66617066 has 16 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 32751888.

The previous prime is 66617053. The next prime is 66617069. The reversal of 66617066 is 66071666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66617069) 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, 45575 + ... + 47013.

It is an arithmetic number, because the mean of its divisors is an integer number (6350400).

Almost surely, 2^66617066 is an apocalyptic number.

66617066 is a deficient number, since it is larger than the sum of its proper divisors (34989334).

66617066 is a wasteful number, since it uses less digits than its factorization.

66617066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66617066 is about 8161.9278359956. The cubic root of 66617066 is about 405.3795476640.

The spelling of 66617066 in words is "sixty-six million, six hundred seventeen thousand, sixty-six".