66817151 has 4 divisors (see below), whose sum is σ = 66847704. Its totient is φ = 66786600.

The previous prime is 66817133. The next prime is 66817171. The reversal of 66817151 is 15171866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66817151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66817111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11720 + ... + 16461.

It is an arithmetic number, because the mean of its divisors is an integer number (16711926).

Almost surely, 2^66817151 is an apocalyptic number.

66817151 is a deficient number, since it is larger than the sum of its proper divisors (30553).

66817151 is a wasteful number, since it uses less digits than its factorization.

66817151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30552.

The product of its digits is 10080, while the sum is 35.

The square root of 66817151 is about 8174.1758605990. The cubic root of 66817151 is about 405.7849958053.

The spelling of 66817151 in words is "sixty-six million, eight hundred seventeen thousand, one hundred fifty-one".