66840513327 has 24 divisors (see below), whose sum is σ = 110461643136. Its totient is φ = 38152435536.

The previous prime is 66840513319. The next prime is 66840513409. The reversal of 66840513327 is 72331504866.

66840513327 is a `hidden beast` number, since 6 + 68 + 40 + 513 + 32 + 7 = 666.

It is not a de Polignac number, because 66840513327 - 2³ = 66840513319 is a prime.

It is a super-3 number, since 3×66840513327³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66840553327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527733 + ... + 642014.

It is an arithmetic number, because the mean of its divisors is an integer number (4602568464).

Almost surely, 2^66840513327 is an apocalyptic number.

66840513327 is a deficient number, since it is larger than the sum of its proper divisors (43621129809).

66840513327 is a wasteful number, since it uses less digits than its factorization.

66840513327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170667 (or 1170664 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 66840513327 in words is "sixty-six billion, eight hundred forty million, five hundred thirteen thousand, three hundred twenty-seven".