1631816672573 has 4 divisors (see below), whose sum is σ = 1658567765628. Its totient is φ = 1605065579520.

The previous prime is 1631816672543. The next prime is 1631816672597. The reversal of 1631816672573 is 3752766181361.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31333602169 + 1600483070404 = 177013^2 + 1265102^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631816672573 - 2²² = 1631812478269 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 (1631816672533) 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, 13375546436 + ... + 13375546557.

It is an arithmetic number, because the mean of its divisors is an integer number (414641941407).

Almost surely, 2^{1631816672573} is an apocalyptic number.

It is an amenable number.

1631816672573 is a deficient number, since it is larger than the sum of its proper divisors (26751093055).

1631816672573 is an equidigital number, since it uses as much as digits as its factorization.

1631816672573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26751093054.

The product of its digits is 7620480, while the sum is 56.

The spelling of 1631816672573 in words is "one trillion, six hundred thirty-one billion, eight hundred sixteen million, six hundred seventy-two thousand, five hundred seventy-three".