66615151 has 4 divisors (see below), whose sum is σ = 66705552. Its totient is φ = 66524752.

The previous prime is 66615139. The next prime is 66615167. The reversal of 66615151 is 15151666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15151666 = 2 ⋅7575833.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66615151 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 (66615181) 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, 44086 + ... + 45571.

It is an arithmetic number, because the mean of its divisors is an integer number (16676388).

Almost surely, 2^66615151 is an apocalyptic number.

66615151 is a deficient number, since it is larger than the sum of its proper divisors (90401).

66615151 is an equidigital number, since it uses as much as digits as its factorization.

66615151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90400.

The product of its digits is 5400, while the sum is 31.

The square root of 66615151 is about 8161.8105221820. The cubic root of 66615151 is about 405.3756632276.

It can be divided in two parts, 66615 and 151, that added together give a palindrome (66766).

The spelling of 66615151 in words is "sixty-six million, six hundred fifteen thousand, one hundred fifty-one".