3261967661 has 2 divisors, whose sum is σ = 3261967662. Its totient is φ = 3261967660.

The previous prime is 3261967559. The next prime is 3261967673. The reversal of 3261967661 is 1667691623.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1995319561 + 1266648100 = 44669^2 + 35590^2 .

It is a cyclic number.

It is not a de Polignac number, because 3261967661 - 2²² = 3257773357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3261927661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630983830 + 1630983831.

It is an arithmetic number, because the mean of its divisors is an integer number (1630983831).

Almost surely, 2^3261967661 is an apocalyptic number.

It is an amenable number.

3261967661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3261967661 is an equidigital number, since it uses as much as digits as its factorization.

3261967661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 3261967661 is about 57113.6381348623. The cubic root of 3261967661 is about 1483.0639685211.

The spelling of 3261967661 in words is "three billion, two hundred sixty-one million, nine hundred sixty-seven thousand, six hundred sixty-one".