66645151 has 4 divisors (see below), whose sum is σ = 70565472. Its totient is φ = 62724832.

The previous prime is 66645149. The next prime is 66645169. The reversal of 66645151 is 15154666.

It is a happy number.

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

It is not a de Polignac number, because 66645151 - 2¹ = 66645149 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 (66645121) 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, 1960135 + ... + 1960168.

It is an arithmetic number, because the mean of its divisors is an integer number (17641368).

Almost surely, 2^66645151 is an apocalyptic number.

66645151 is a deficient number, since it is larger than the sum of its proper divisors (3920321).

66645151 is a wasteful number, since it uses less digits than its factorization.

66645151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920320.

The product of its digits is 21600, while the sum is 34.

The square root of 66645151 is about 8163.6481428342. The cubic root of 66645151 is about 405.4365074678.

The spelling of 66645151 in words is "sixty-six million, six hundred forty-five thousand, one hundred fifty-one".