1963263649 has 16 divisors (see below), whose sum is σ = 2126331648. Its totient is φ = 1805608192.

The previous prime is 1963263641. The next prime is 1963263677. The reversal of 1963263649 is 9463623691.

It is a cyclic number.

It is not a de Polignac number, because 1963263649 - 2³ = 1963263641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1963263641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635262 + ... + 638344.

It is an arithmetic number, because the mean of its divisors is an integer number (132895728).

Almost surely, 2^1963263649 is an apocalyptic number.

It is an amenable number.

1963263649 is a deficient number, since it is larger than the sum of its proper divisors (163067999).

1963263649 is a wasteful number, since it uses less digits than its factorization.

1963263649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944.

The product of its digits is 1259712, while the sum is 49.

The square root of 1963263649 is about 44308.7310696210. The cubic root of 1963263649 is about 1252.1591799926.

The spelling of 1963263649 in words is "one billion, nine hundred sixty-three million, two hundred sixty-three thousand, six hundred forty-nine".