3945261563 has 2 divisors, whose sum is σ = 3945261564. Its totient is φ = 3945261562.

The previous prime is 3945261557. The next prime is 3945261583. The reversal of 3945261563 is 3651625493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3945261563 - 2⁶ = 3945261499 is a prime.

It is not a weakly prime, because it can be changed into another prime (3945261583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972630781 + 1972630782.

It is an arithmetic number, because the mean of its divisors is an integer number (1972630782).

Almost surely, 2^3945261563 is an apocalyptic number.

3945261563 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945261563 is an equidigital number, since it uses as much as digits as its factorization.

3945261563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 44.

The square root of 3945261563 is about 62811.3171570220. The cubic root of 3945261563 is about 1580.1267808057.

The spelling of 3945261563 in words is "three billion, nine hundred forty-five million, two hundred sixty-one thousand, five hundred sixty-three".