6561146616 has 16 divisors (see below), whose sum is σ = 16402866600. Its totient is φ = 2187048864.

The previous prime is 6561146593. The next prime is 6561146663. The reversal of 6561146616 is 6166411656.

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, 136690531 + ... + 136690578.

Almost surely, 2^6561146616 is an apocalyptic number.

It is an amenable number.

6561146616 is an abundant number, since it is smaller than the sum of its proper divisors (9841719984).

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

6561146616 is a wasteful number, since it uses less digits than its factorization.

6561146616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273381118 (or 273381114 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 6561146616 is about 81000.9050319810. The cubic root of 6561146616 is about 1872.0893854791.

The spelling of 6561146616 in words is "six billion, five hundred sixty-one million, one hundred forty-six thousand, six hundred sixteen".