66161247 has 8 divisors (see below), whose sum is σ = 88281600. Its totient is φ = 44074200.

The previous prime is 66161197. The next prime is 66161281. The reversal of 66161247 is 74216166.

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

It is not a de Polignac number, because 66161247 - 2¹⁵ = 66128479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161747) 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, 3247 + ... + 11952.

It is an arithmetic number, because the mean of its divisors is an integer number (11035200).

Almost surely, 2^66161247 is an apocalyptic number.

66161247 is a deficient number, since it is larger than the sum of its proper divisors (22120353).

66161247 is a wasteful number, since it uses less digits than its factorization.

66161247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16653.

The product of its digits is 12096, while the sum is 33.

The square root of 66161247 is about 8133.9564173900. The cubic root of 66161247 is about 404.4528444201.

The spelling of 66161247 in words is "sixty-six million, one hundred sixty-one thousand, two hundred forty-seven".