66170661 has 8 divisors (see below), whose sum is σ = 88278240. Its totient is φ = 44088432.

The previous prime is 66170641. The next prime is 66170669. The reversal of 66170661 is 16607166.

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

It is not a de Polignac number, because 66170661 - 2²¹ = 64073509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66170669) 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, 955 + ... + 11543.

It is an arithmetic number, because the mean of its divisors is an integer number (11034780).

Almost surely, 2^66170661 is an apocalyptic number.

It is an amenable number.

66170661 is a deficient number, since it is larger than the sum of its proper divisors (22107579).

66170661 is a wasteful number, since it uses less digits than its factorization.

66170661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12675.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 66170661 is about 8134.5350819823. The cubic root of 66170661 is about 404.4720265380.

The spelling of 66170661 in words is "sixty-six million, one hundred seventy thousand, six hundred sixty-one".