6561849830 has 16 divisors (see below), whose sum is σ = 11821594464. Its totient is φ = 2622458880.

The previous prime is 6561849803. The next prime is 6561849857. The reversal of 6561849830 is 389481656.

It is an interprime number because it is at equal distance from previous prime (6561849803) and next prime (6561849857).

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, 273026 + ... + 296085.

It is an arithmetic number, because the mean of its divisors is an integer number (738849654).

Almost surely, 2^6561849830 is an apocalyptic number.

6561849830 is a deficient number, since it is larger than the sum of its proper divisors (5259744634).

6561849830 is a wasteful number, since it uses less digits than its factorization.

6561849830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570271.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 6561849830 is about 81005.2456943376. The cubic root of 6561849830 is about 1872.1562656812.

The spelling of 6561849830 in words is "six billion, five hundred sixty-one million, eight hundred forty-nine thousand, eight hundred thirty".