20161518122977 has 32 divisors (see below), whose sum is σ = 25288322863104. Its totient is φ = 15615356126400.

The previous prime is 20161518122959. The next prime is 20161518123011. The reversal of 20161518122977 is 77922181516102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20161518122977 - 2¹⁵ = 20161518090209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20161518122077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 350649043 + ... + 350706535.

It is an arithmetic number, because the mean of its divisors is an integer number (790260089472).

Almost surely, 2^{20161518122977} is an apocalyptic number.

It is an amenable number.

20161518122977 is a deficient number, since it is larger than the sum of its proper divisors (5126804740127).

20161518122977 is a wasteful number, since it uses less digits than its factorization.

20161518122977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84949.

The product of its (nonzero) digits is 846720, while the sum is 52.

The spelling of 20161518122977 in words is "twenty trillion, one hundred sixty-one billion, five hundred eighteen million, one hundred twenty-two thousand, nine hundred seventy-seven".