42820861941 has 72 divisors (see below), whose sum is σ = 75195939000. Its totient is φ = 23307989760.

The previous prime is 42820861931. The next prime is 42820861973. The reversal of 42820861941 is 14916802824.

42820861941 is a `hidden beast` number, since 4 + 2 + 8 + 20 + 8 + 619 + 4 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 553613841 + 42267248100 = 23529^2 + 205590^2 .

It is not a de Polignac number, because 42820861941 - 2⁹ = 42820861429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42820861921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 482935 + ... + 564683.

Almost surely, 2^42820861941 is an apocalyptic number.

It is an amenable number.

42820861941 is a deficient number, since it is larger than the sum of its proper divisors (32375077059).

42820861941 is a wasteful number, since it uses less digits than its factorization.

42820861941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81827 (or 81813 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 42820861941 in words is "forty-two billion, eight hundred twenty million, eight hundred sixty-one thousand, nine hundred forty-one".