66938527 has 4 divisors (see below), whose sum is σ = 68571216. Its totient is φ = 65305840.

The previous prime is 66938507. The next prime is 66938551. The reversal of 66938527 is 72583966.

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 66938527 - 2¹⁹ = 66414239 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 (66938507) 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, 816283 + ... + 816364.

It is an arithmetic number, because the mean of its divisors is an integer number (17142804).

Almost surely, 2^66938527 is an apocalyptic number.

66938527 is a deficient number, since it is larger than the sum of its proper divisors (1632689).

66938527 is a wasteful number, since it uses less digits than its factorization.

66938527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632688.

The product of its digits is 544320, while the sum is 46.

The square root of 66938527 is about 8181.5968490265. The cubic root of 66938527 is about 406.0305553455.

The spelling of 66938527 in words is "sixty-six million, nine hundred thirty-eight thousand, five hundred twenty-seven".