1491256400263 has 12 divisors (see below), whose sum is σ = 1736446144080. Its totient is φ = 1276952910912.

The previous prime is 1491256400261. The next prime is 1491256400273. The reversal of 1491256400263 is 3620046521941.

It is not a de Polignac number, because 1491256400263 - 2¹ = 1491256400261 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 (1491256400261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15031731 + ... + 15130612.

It is an arithmetic number, because the mean of its divisors is an integer number (144703845340).

Almost surely, 2^{1491256400263} is an apocalyptic number.

1491256400263 is a deficient number, since it is larger than the sum of its proper divisors (245189743817).

1491256400263 is a wasteful number, since it uses less digits than its factorization.

1491256400263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30163366 (or 30163359 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 1491256400263 in words is "one trillion, four hundred ninety-one billion, two hundred fifty-six million, four hundred thousand, two hundred sixty-three".