3640063991 has 2 divisors, whose sum is σ = 3640063992. Its totient is φ = 3640063990.

The previous prime is 3640063901. The next prime is 3640064017. The reversal of 3640063991 is 1993600463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3640063991 - 2³⁰ = 2566322167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640063901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820031995 + 1820031996.

It is an arithmetic number, because the mean of its divisors is an integer number (1820031996).

Almost surely, 2^3640063991 is an apocalyptic number.

3640063991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640063991 is an equidigital number, since it uses as much as digits as its factorization.

3640063991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 3640063991 is about 60332.9428339112. The cubic root of 3640063991 is about 1538.2833504028.

The spelling of 3640063991 in words is "three billion, six hundred forty million, sixty-three thousand, nine hundred ninety-one".