20126777566161 has 16 divisors (see below), whose sum is σ = 31658710028288. Its totient is φ = 11130015243600.

The previous prime is 20126777566157. The next prime is 20126777566171. The reversal of 20126777566161 is 16166577762102.

It is not a de Polignac number, because 20126777566161 - 2² = 20126777566157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20126777566171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15458353855 + ... + 15458355156.

It is an arithmetic number, because the mean of its divisors is an integer number (1978669376768).

Almost surely, 2^{20126777566161} is an apocalyptic number.

20126777566161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20126777566161 is a deficient number, since it is larger than the sum of its proper divisors (11531932462127).

20126777566161 is a wasteful number, since it uses less digits than its factorization.

20126777566161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30916709052.

The product of its (nonzero) digits is 8890560, while the sum is 57.

The spelling of 20126777566161 in words is "twenty trillion, one hundred twenty-six billion, seven hundred seventy-seven million, five hundred sixty-six thousand, one hundred sixty-one".