12820042377 has 6 divisors (see below), whose sum is σ = 18517839002. Its totient is φ = 8546694912.

The previous prime is 12820042357. The next prime is 12820042409. The reversal of 12820042377 is 77324002821.

12820042377 is a `hidden beast` number, since 1 + 28 + 200 + 423 + 7 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11420983161 + 1399059216 = 106869^2 + 37404^2 .

It is not a de Polignac number, because 12820042377 - 2¹¹ = 12820040329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12820042307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712224568 + ... + 712224585.

Almost surely, 2^12820042377 is an apocalyptic number.

It is an amenable number.

12820042377 is a deficient number, since it is larger than the sum of its proper divisors (5697796625).

12820042377 is a wasteful number, since it uses less digits than its factorization.

12820042377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424449159 (or 1424449156 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 12820042377 in words is "twelve billion, eight hundred twenty million, forty-two thousand, three hundred seventy-seven".