66416266531 has 8 divisors (see below), whose sum is σ = 67024900800. Its totient is φ = 65809172520.

The previous prime is 66416266387. The next prime is 66416266561. The reversal of 66416266531 is 13566261466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66416266531 - 2¹⁷ = 66416135459 is a prime.

It is a super-2 number, since 2×66416266531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66416266561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298341 + ... + 470998.

It is an arithmetic number, because the mean of its divisors is an integer number (8378112600).

Almost surely, 2^66416266531 is an apocalyptic number.

66416266531 is a deficient number, since it is larger than the sum of its proper divisors (608634269).

66416266531 is a wasteful number, since it uses less digits than its factorization.

66416266531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770129.

The product of its digits is 933120, while the sum is 46.

The spelling of 66416266531 in words is "sixty-six billion, four hundred sixteen million, two hundred sixty-six thousand, five hundred thirty-one".