1001778041263 has 4 divisors (see below), whose sum is σ = 1004648465800. Its totient is φ = 998907616728.

The previous prime is 1001778041239. The next prime is 1001778041321. The reversal of 1001778041263 is 3621408771001.

It is a happy number.

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-1001778041263 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 (1001778041233) 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, 1435211745 + ... + 1435212442.

It is an arithmetic number, because the mean of its divisors is an integer number (251162116450).

Almost surely, 2^{1001778041263} is an apocalyptic number.

1001778041263 is a deficient number, since it is larger than the sum of its proper divisors (2870424537).

1001778041263 is an equidigital number, since it uses as much as digits as its factorization.

1001778041263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870424536.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 1001778041263 in words is "one trillion, one billion, seven hundred seventy-eight million, forty-one thousand, two hundred sixty-three".