642136124542 has 16 divisors (see below), whose sum is σ = 1050799536000. Its totient is φ = 291871353240.

The previous prime is 642136124533. The next prime is 642136124579. The reversal of 642136124542 is 245421631246.

642136124542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642136124495 and 642136124504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350959 + ... + 1186357.

It is an arithmetic number, because the mean of its divisors is an integer number (65674971000).

Almost surely, 2^642136124542 is an apocalyptic number.

642136124542 is a deficient number, since it is larger than the sum of its proper divisors (408663411458).

642136124542 is a wasteful number, since it uses less digits than its factorization.

642136124542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870351.

The product of its digits is 276480, while the sum is 40.

Adding to 642136124542 its reverse (245421631246), we get a palindrome (887557755788).

The spelling of 642136124542 in words is "six hundred forty-two billion, one hundred thirty-six million, one hundred twenty-four thousand, five hundred forty-two".