6557570081 has 2 divisors, whose sum is σ = 6557570082. Its totient is φ = 6557570080.

The previous prime is 6557569973. The next prime is 6557570101. The reversal of 6557570081 is 1800757556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5730490000 + 827080081 = 75700^2 + 28759^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557570081 - 2³⁰ = 5483828257 is a prime.

It is a super-2 number, since 2×6557570081² = 86003450734452693122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6557572081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3278785040 + 3278785041.

It is an arithmetic number, because the mean of its divisors is an integer number (3278785041).

Almost surely, 2^6557570081 is an apocalyptic number.

It is an amenable number.

6557570081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6557570081 is an equidigital number, since it uses as much as digits as its factorization.

6557570081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294000, while the sum is 44.

The square root of 6557570081 is about 80978.8248926841. The cubic root of 6557570081 is about 1871.7491598764.

The spelling of 6557570081 in words is "six billion, five hundred fifty-seven million, five hundred seventy thousand, eighty-one".