66531413567 has 4 divisors (see below), whose sum is σ = 67190140536. Its totient is φ = 65872686600.

The previous prime is 66531413549. The next prime is 66531413587. The reversal of 66531413567 is 76531413566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76531413566 = 2 ⋅38265706783.

It is a cyclic number.

It is not a de Polignac number, because 66531413567 - 2¹⁶ = 66531348031 is a prime.

It is a super-3 number, since 3×66531413567³ (a number of 33 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 (66531413587) 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, 329363333 + ... + 329363534.

It is an arithmetic number, because the mean of its divisors is an integer number (16797535134).

Almost surely, 2^66531413567 is an apocalyptic number.

66531413567 is a deficient number, since it is larger than the sum of its proper divisors (658726969).

66531413567 is a wasteful number, since it uses less digits than its factorization.

66531413567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658726968.

The product of its digits is 1360800, while the sum is 47.

Subtracting 66531413567 from its reverse (76531413566), we obtain a palindrome (9999999999).

The spelling of 66531413567 in words is "sixty-six billion, five hundred thirty-one million, four hundred thirteen thousand, five hundred sixty-seven".