3257663561 has 2 divisors, whose sum is σ = 3257663562. Its totient is φ = 3257663560.

The previous prime is 3257663527. The next prime is 3257663587. The reversal of 3257663561 is 1653667523.

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., 2349243961 + 908419600 = 48469^2 + 30140^2 .

It is a cyclic number.

It is not a de Polignac number, because 3257663561 - 2¹⁸ = 3257401417 is a prime.

It is a super-2 number, since 2×3257663561² = 21224743753334401442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3257663501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1628831780 + 1628831781.

It is an arithmetic number, because the mean of its divisors is an integer number (1628831781).

Almost surely, 2^3257663561 is an apocalyptic number.

It is an amenable number.

3257663561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3257663561 is an equidigital number, since it uses as much as digits as its factorization.

3257663561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 44.

The square root of 3257663561 is about 57075.9455550234. The cubic root of 3257663561 is about 1482.4113904991.

The spelling of 3257663561 in words is "three billion, two hundred fifty-seven million, six hundred sixty-three thousand, five hundred sixty-one".