1005716256631 has 4 divisors (see below), whose sum is σ = 1024692035112. Its totient is φ = 986740478152.

The previous prime is 1005716256619. The next prime is 1005716256647. The reversal of 1005716256631 is 1366526175001.

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

It is a cyclic number.

It is not a de Polignac number, because 1005716256631 - 2²¹ = 1005714159479 is a prime.

It is a super-2 number, since 2×1005716256631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005716256031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9487889161 + ... + 9487889266.

It is an arithmetic number, because the mean of its divisors is an integer number (256173008778).

Almost surely, 2^{1005716256631} is an apocalyptic number.

1005716256631 is a deficient number, since it is larger than the sum of its proper divisors (18975778481).

1005716256631 is an equidigital number, since it uses as much as digits as its factorization.

1005716256631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18975778480.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 1005716256631 in words is "one trillion, five billion, seven hundred sixteen million, two hundred fifty-six thousand, six hundred thirty-one".