6566988478761 has 12 divisors (see below), whose sum is σ = 9898069591488. Its totient is φ = 4187644826904.

The previous prime is 6566988478753. The next prime is 6566988478829. The reversal of 6566988478761 is 1678748896656.

6566988478761 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 9 + 88 + 478 + 7 + 61 = 666.

It is not a de Polignac number, because 6566988478761 - 2³ = 6566988478753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6566988278761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15862290805 + ... + 15862291218.

It is an arithmetic number, because the mean of its divisors is an integer number (824839132624).

Almost surely, 2^{6566988478761} is an apocalyptic number.

It is an amenable number.

6566988478761 is a deficient number, since it is larger than the sum of its proper divisors (3331081112727).

6566988478761 is a wasteful number, since it uses less digits than its factorization.

6566988478761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31724582052 (or 31724582049 counting only the distinct ones).

The product of its digits is 5852528640, while the sum is 81.

The spelling of 6566988478761 in words is "six trillion, five hundred sixty-six billion, nine hundred eighty-eight million, four hundred seventy-eight thousand, seven hundred sixty-one".