6561046556 has 24 divisors (see below), whose sum is σ = 11717671056. Its totient is φ = 3213682560.

The previous prime is 6561046549. The next prime is 6561046573. The reversal of 6561046556 is 6556401656.

It is a happy number.

It is a super-2 number, since 2×6561046556² = 86094663819998922272, which contains 22 as substring.

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, 19121 + ... + 116136.

It is an arithmetic number, because the mean of its divisors is an integer number (488236294).

Almost surely, 2^6561046556 is an apocalyptic number.

It is an amenable number.

6561046556 is a deficient number, since it is larger than the sum of its proper divisors (5156624500).

6561046556 is a wasteful number, since it uses less digits than its factorization.

6561046556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135509 (or 135507 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 6561046556 is about 81000.2873822062. The cubic root of 6561046556 is about 1872.0798687373.

The spelling of 6561046556 in words is "six billion, five hundred sixty-one million, forty-six thousand, five hundred fifty-six".