66770471 has 4 divisors (see below), whose sum is σ = 67418832. Its totient is φ = 66122112.

The previous prime is 66770467. The next prime is 66770489. The reversal of 66770471 is 17407766.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66770471 - 2² = 66770467 is a prime.

It is a super-3 number, since 3×66770471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324026 + ... + 324231.

It is an arithmetic number, because the mean of its divisors is an integer number (16854708).

Almost surely, 2^66770471 is an apocalyptic number.

66770471 is a deficient number, since it is larger than the sum of its proper divisors (648361).

66770471 is a wasteful number, since it uses less digits than its factorization.

66770471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648360.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 66770471 is about 8171.3200280004. The cubic root of 66770471 is about 405.6904768774.

The spelling of 66770471 in words is "sixty-six million, seven hundred seventy thousand, four hundred seventy-one".