1656061566081 has 16 divisors (see below), whose sum is σ = 2379208327104. Its totient is φ = 1018568908224.

The previous prime is 1656061566053. The next prime is 1656061566119. The reversal of 1656061566081 is 1806651606561.

It is not a de Polignac number, because 1656061566081 - 2¹⁷ = 1656061435009 is a prime.

It is a super-2 number, since 2×1656061566081² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1656061546081) 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 15 ways as a sum of consecutive naturals, for example, 11299206 + ... + 11444831.

It is an arithmetic number, because the mean of its divisors is an integer number (148700520444).

Almost surely, 2^{1656061566081} is an apocalyptic number.

It is an amenable number.

1656061566081 is a deficient number, since it is larger than the sum of its proper divisors (723146761023).

1656061566081 is a wasteful number, since it uses less digits than its factorization.

1656061566081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22745920.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 1656061566081 in words is "one trillion, six hundred fifty-six billion, sixty-one million, five hundred sixty-six thousand, eighty-one".