66566155 has 8 divisors (see below), whose sum is σ = 79923312. Its totient is φ = 53223648.

The previous prime is 66566141. The next prime is 66566221. The reversal of 66566155 is 55166566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66566155 - 2¹³ = 66557963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14892 + ... + 18838.

It is an arithmetic number, because the mean of its divisors is an integer number (9990414).

Almost surely, 2^66566155 is an apocalyptic number.

66566155 is a deficient number, since it is larger than the sum of its proper divisors (13357157).

66566155 is a wasteful number, since it uses less digits than its factorization.

66566155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7325.

The product of its digits is 162000, while the sum is 40.

The square root of 66566155 is about 8158.8084301569. The cubic root of 66566155 is about 405.2762531225.

The spelling of 66566155 in words is "sixty-six million, five hundred sixty-six thousand, one hundred fifty-five".