1251324663563 has 4 divisors (see below), whose sum is σ = 1347580406928. Its totient is φ = 1155068920200.

The previous prime is 1251324663529. The next prime is 1251324663569. The reversal of 1251324663563 is 3653664231521.

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

It is not a de Polignac number, because 1251324663563 - 2⁸ = 1251324663307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251324663569) 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, 48127871663 + ... + 48127871688.

It is an arithmetic number, because the mean of its divisors is an integer number (336895101732).

Almost surely, 2^{1251324663563} is an apocalyptic number.

1251324663563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1251324663563 is a deficient number, since it is larger than the sum of its proper divisors (96255743365).

1251324663563 is an equidigital number, since it uses as much as digits as its factorization.

1251324663563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96255743364.

The product of its digits is 2332800, while the sum is 47.

The spelling of 1251324663563 in words is "one trillion, two hundred fifty-one billion, three hundred twenty-four million, six hundred sixty-three thousand, five hundred sixty-three".