66062160656581 has 8 divisors (see below), whose sum is σ = 66669514333400. Its totient is φ = 65454830231040.

The previous prime is 66062160656543. The next prime is 66062160656599. The reversal of 66062160656581 is 18565606126066.

It can be written as a sum of positive squares in 4 ways, for example, as 5035832212356 + 61026328444225 = 2244066^2 + 7811935^2 .

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 66062160656581 - 2¹¹ = 66062160654533 is a prime.

It is a super-2 number, since 2×66062160656581² (a number of 28 digits) contains 22 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 (66062160656281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78360 + ... + 11494801.

It is an arithmetic number, because the mean of its divisors is an integer number (8333689291675).

Almost surely, 2^{66062160656581} is an apocalyptic number.

It is an amenable number.

66062160656581 is a deficient number, since it is larger than the sum of its proper divisors (607353676819).

66062160656581 is a wasteful number, since it uses less digits than its factorization.

66062160656581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11625639.

The product of its (nonzero) digits is 18662400, while the sum is 58.

The spelling of 66062160656581 in words is "sixty-six trillion, sixty-two billion, one hundred sixty million, six hundred fifty-six thousand, five hundred eighty-one".