20178978814377 has 12 divisors (see below), whose sum is σ = 29155098420084. Its totient is φ = 13449105815040.

The previous prime is 20178978814369. The next prime is 20178978814391. The reversal of 20178978814377 is 77341887987102.

20178978814377 is a `hidden beast` number, since 2 + 0 + 178 + 9 + 7 + 8 + 81 + 4 + 377 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3667726747161 + 16511252067216 = 1915131^2 + 4063404^2 .

It is not a de Polignac number, because 20178978814377 - 2³ = 20178978814369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20178978884377) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295524624 + ... + 295592897.

It is an arithmetic number, because the mean of its divisors is an integer number (2429591535007).

Almost surely, 2^{20178978814377} is an apocalyptic number.

It is an amenable number.

20178978814377 is a deficient number, since it is larger than the sum of its proper divisors (8976119605707).

20178978814377 is a wasteful number, since it uses less digits than its factorization.

20178978814377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591121320 (or 591121317 counting only the distinct ones).

The product of its (nonzero) digits is 265531392, while the sum is 72.

The spelling of 20178978814377 in words is "twenty trillion, one hundred seventy-eight billion, nine hundred seventy-eight million, eight hundred fourteen thousand, three hundred seventy-seven".