1263855385783 has 4 divisors (see below), whose sum is σ = 1263857656000. Its totient is φ = 1263853115568.

The previous prime is 1263855385777. The next prime is 1263855385787. The reversal of 1263855385783 is 3875835583621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263855385783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263855385787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332218 + ... + 1624216.

It is an arithmetic number, because the mean of its divisors is an integer number (315964414000).

Almost surely, 2^{1263855385783} is an apocalyptic number.

1263855385783 is a deficient number, since it is larger than the sum of its proper divisors (2270217).

1263855385783 is an equidigital number, since it uses as much as digits as its factorization.

1263855385783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270216.

The product of its digits is 145152000, while the sum is 64.

The spelling of 1263855385783 in words is "one trillion, two hundred sixty-three billion, eight hundred fifty-five million, three hundred eighty-five thousand, seven hundred eighty-three".