6561535142 has 4 divisors (see below), whose sum is σ = 9842302716. Its totient is φ = 3280767570.

The previous prime is 6561535111. The next prime is 6561535147. The reversal of 6561535142 is 2415351656.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6561535096 and 6561535105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561535147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640383784 + ... + 1640383787.

It is an arithmetic number, because the mean of its divisors is an integer number (2460575679).

Almost surely, 2^6561535142 is an apocalyptic number.

6561535142 is a deficient number, since it is larger than the sum of its proper divisors (3280767574).

6561535142 is a wasteful number, since it uses less digits than its factorization.

6561535142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280767573.

The product of its digits is 108000, while the sum is 38.

The square root of 6561535142 is about 81003.3032783232. The cubic root of 6561535142 is about 1872.1263374067.

Adding to 6561535142 its reverse (2415351656), we get a palindrome (8976886798).

The spelling of 6561535142 in words is "six billion, five hundred sixty-one million, five hundred thirty-five thousand, one hundred forty-two".