66040512130661 has 4 divisors (see below), whose sum is σ = 67159842844800. Its totient is φ = 64921181416524.

The previous prime is 66040512130601. The next prime is 66040512130693. The reversal of 66040512130661 is 16603121504066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66040512130661 - 2³⁴ = 66023332261477 is a prime.

It is a super-2 number, since 2×66040512130661² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66040512130601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559665356981 + ... + 559665357098.

It is an arithmetic number, because the mean of its divisors is an integer number (16789960711200).

Almost surely, 2^{66040512130661} is an apocalyptic number.

It is an amenable number.

66040512130661 is a deficient number, since it is larger than the sum of its proper divisors (1119330714139).

66040512130661 is a wasteful number, since it uses less digits than its factorization.

66040512130661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119330714138.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 66040512130661 in words is "sixty-six trillion, forty billion, five hundred twelve million, one hundred thirty thousand, six hundred sixty-one".