6561554354 has 16 divisors (see below), whose sum is σ = 10409462880. Its totient is φ = 3093370560.

The previous prime is 6561554317. The next prime is 6561554357. The reversal of 6561554354 is 4534551656.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6561554357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401159 + ... + 417194.

It is an arithmetic number, because the mean of its divisors is an integer number (650591430).

Almost surely, 2^6561554354 is an apocalyptic number.

6561554354 is a deficient number, since it is larger than the sum of its proper divisors (3847908526).

6561554354 is a wasteful number, since it uses less digits than its factorization.

6561554354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818585.

The product of its digits is 1080000, while the sum is 44.

The square root of 6561554354 is about 81003.4218659928. The cubic root of 6561554354 is about 1872.1281645836.

The spelling of 6561554354 in words is "six billion, five hundred sixty-one million, five hundred fifty-four thousand, three hundred fifty-four".