3557986561 has 2 divisors, whose sum is σ = 3557986562. Its totient is φ = 3557986560.

The previous prime is 3557986543. The next prime is 3557986571. The reversal of 3557986561 is 1656897553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1938728961 + 1619257600 = 44031^2 + 40240^2 .

It is an emirp because it is prime and its reverse (1656897553) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3557986561 is a prime.

It is not a weakly prime, because it can be changed into another prime (3557986571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1778993280 + 1778993281.

It is an arithmetic number, because the mean of its divisors is an integer number (1778993281).

Almost surely, 2^3557986561 is an apocalyptic number.

It is an amenable number.

3557986561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3557986561 is an equidigital number, since it uses as much as digits as its factorization.

3557986561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804000, while the sum is 55.

The square root of 3557986561 is about 59648.8605171968. The cubic root of 3557986561 is about 1526.6334283098.

The spelling of 3557986561 in words is "three billion, five hundred fifty-seven million, nine hundred eighty-six thousand, five hundred sixty-one".