20155537136777 has 16 divisors (see below), whose sum is σ = 24365682958080. Its totient is φ = 16298666284032.

The previous prime is 20155537136771. The next prime is 20155537136821. The reversal of 20155537136777 is 77763173555102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20155537136777 - 2¹⁸ = 20155536874633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20155537136771) 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, 857451752 + ... + 857475257.

It is an arithmetic number, because the mean of its divisors is an integer number (1522855184880).

Almost surely, 2^{20155537136777} is an apocalyptic number.

It is an amenable number.

20155537136777 is a deficient number, since it is larger than the sum of its proper divisors (4210145821303).

20155537136777 is a wasteful number, since it uses less digits than its factorization.

20155537136777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714927112.

The product of its (nonzero) digits is 32413500, while the sum is 59.

The spelling of 20155537136777 in words is "twenty trillion, one hundred fifty-five billion, five hundred thirty-seven million, one hundred thirty-six thousand, seven hundred seventy-seven".