20131671156066 has 12 divisors (see below), whose sum is σ = 43618620838182. Its totient is φ = 6710557052016.

The previous prime is 20131671156017. The next prime is 20131671156083. The reversal of 20131671156066 is 66065117613102.

20131671156066 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 16 + 7 + 11 + 560 + 66 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11776420759041 + 8355250397025 = 3431679^2 + 2890545^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 559213087651 + ... + 559213087686.

Almost surely, 2^{20131671156066} is an apocalyptic number.

20131671156066 is an abundant number, since it is smaller than the sum of its proper divisors (23486949682116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20131671156066 is a wasteful number, since it uses less digits than its factorization.

20131671156066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118426175345 (or 1118426175342 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

Adding to 20131671156066 its reverse (66065117613102), we get a palindrome (86196788769168).

The spelling of 20131671156066 in words is "twenty trillion, one hundred thirty-one billion, six hundred seventy-one million, one hundred fifty-six thousand, sixty-six".