66538479 has 32 divisors (see below), whose sum is σ = 104177664. Its totient is φ = 36990720.

The previous prime is 66538421. The next prime is 66538481. The reversal of 66538479 is 97483566.

It is not a de Polignac number, because 66538479 - 2¹² = 66534383 is a prime.

Its product of digits (1088640) is a multiple of the sum of its prime divisors (567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66538279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212427 + ... + 212739.

It is an arithmetic number, because the mean of its divisors is an integer number (3255552).

Almost surely, 2^66538479 is an apocalyptic number.

66538479 is a deficient number, since it is larger than the sum of its proper divisors (37639185).

66538479 is a wasteful number, since it uses less digits than its factorization.

66538479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567.

The product of its digits is 1088640, while the sum is 48.

The square root of 66538479 is about 8157.1121728219. The cubic root of 66538479 is about 405.2200785274.

The spelling of 66538479 in words is "sixty-six million, five hundred thirty-eight thousand, four hundred seventy-nine".