3557685749 has 2 divisors, whose sum is σ = 3557685750. Its totient is φ = 3557685748.

The previous prime is 3557685721. The next prime is 3557685773. The reversal of 3557685749 is 9475867553.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2255775025 + 1301910724 = 47495^2 + 36082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3557685749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3557685779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1778842874 + 1778842875.

It is an arithmetic number, because the mean of its divisors is an integer number (1778842875).

Almost surely, 2^3557685749 is an apocalyptic number.

It is an amenable number.

3557685749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3557685749 is an equidigital number, since it uses as much as digits as its factorization.

3557685749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752000, while the sum is 59.

The square root of 3557685749 is about 59646.3389404580. The cubic root of 3557685749 is about 1526.5904037331.

The spelling of 3557685749 in words is "three billion, five hundred fifty-seven million, six hundred eighty-five thousand, seven hundred forty-nine".