523640442042 has 32 divisors (see below), whose sum is σ = 1170146260800. Its totient is φ = 173571688944.

The previous prime is 523640442041. The next prime is 523640442071. The reversal of 523640442042 is 240244046325.

523640442042 is a `hidden beast` number, since 5 + 2 + 3 + 640 + 4 + 4 + 2 + 0 + 4 + 2 = 666.

It is a super-2 number, since 2×523640442042² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 523640441988 and 523640442006.

It is not an unprimeable number, because it can be changed into a prime (523640442041) 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 15 ways as a sum of consecutive naturals, for example, 27077053 + ... + 27096384.

It is an arithmetic number, because the mean of its divisors is an integer number (36567070650).

Almost surely, 2^523640442042 is an apocalyptic number.

523640442042 is an abundant number, since it is smaller than the sum of its proper divisors (646505818758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

523640442042 is a wasteful number, since it uses less digits than its factorization.

523640442042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54173627 (or 54173621 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 36.

Adding to 523640442042 its reverse (240244046325), we get a palindrome (763884488367).

The spelling of 523640442042 in words is "five hundred twenty-three billion, six hundred forty million, four hundred forty-two thousand, forty-two".