66982151 has 4 divisors (see below), whose sum is σ = 68615904. Its totient is φ = 65348400.

The previous prime is 66982133. The next prime is 66982171. The reversal of 66982151 is 15128966.

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-66982151 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 (66982171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816815 + ... + 816896.

It is an arithmetic number, because the mean of its divisors is an integer number (17153976).

Almost surely, 2^66982151 is an apocalyptic number.

66982151 is a deficient number, since it is larger than the sum of its proper divisors (1633753).

66982151 is a wasteful number, since it uses less digits than its factorization.

66982151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633752.

The product of its digits is 25920, while the sum is 38.

The square root of 66982151 is about 8184.2623980417. The cubic root of 66982151 is about 406.1187398900.

The spelling of 66982151 in words is "sixty-six million, nine hundred eighty-two thousand, one hundred fifty-one".