6561849142 has 8 divisors (see below), whose sum is σ = 10421760456. Its totient is φ = 3087928992.

The previous prime is 6561849131. The next prime is 6561849157. The reversal of 6561849142 is 2419481656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6561849142² = 86115728324732272328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6561849092 and 6561849101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96497748 + ... + 96497815.

It is an arithmetic number, because the mean of its divisors is an integer number (1302720057).

Almost surely, 2^6561849142 is an apocalyptic number.

6561849142 is a deficient number, since it is larger than the sum of its proper divisors (3859911314).

6561849142 is a wasteful number, since it uses less digits than its factorization.

6561849142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192995582.

The product of its digits is 414720, while the sum is 46.

The square root of 6561849142 is about 81005.2414476989. The cubic root of 6561849142 is about 1872.1562002503.

The spelling of 6561849142 in words is "six billion, five hundred sixty-one million, eight hundred forty-nine thousand, one hundred forty-two".