6656161556577 has 32 divisors (see below), whose sum is σ = 9631349728000. Its totient is φ = 4064587921152.

The previous prime is 6656161556543. The next prime is 6656161556593. The reversal of 6656161556577 is 7756551616566.

It is not a de Polignac number, because 6656161556577 - 2⁷ = 6656161556449 is a prime.

It is a super-4 number, since 4×6656161556577⁴ (a number of 52 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (6656161556677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1745199 + ... + 4044507.

It is an arithmetic number, because the mean of its divisors is an integer number (300979679000).

Almost surely, 2^{6656161556577} is an apocalyptic number.

It is an amenable number.

6656161556577 is a deficient number, since it is larger than the sum of its proper divisors (2975188171423).

6656161556577 is a wasteful number, since it uses less digits than its factorization.

6656161556577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299897.

The product of its digits is 238140000, while the sum is 66.

The spelling of 6656161556577 in words is "six trillion, six hundred fifty-six billion, one hundred sixty-one million, five hundred fifty-six thousand, five hundred seventy-seven".