673638235153 has 4 divisors (see below), whose sum is σ = 725456560948. Its totient is φ = 621819909360.

The previous prime is 673638235141. The next prime is 673638235189. The reversal of 673638235153 is 351532836376.

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 144539113489 + 529099121664 = 380183^2 + 727392^2 .

It is not a de Polignac number, because 673638235153 - 2¹⁷ = 673638104081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 673638235153.

It is not an unprimeable number, because it can be changed into a prime (673638235103) 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, 25909162878 + ... + 25909162903.

It is an arithmetic number, because the mean of its divisors is an integer number (181364140237).

Almost surely, 2^673638235153 is an apocalyptic number.

It is an amenable number.

673638235153 is a deficient number, since it is larger than the sum of its proper divisors (51818325795).

673638235153 is a wasteful number, since it uses less digits than its factorization.

673638235153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51818325794.

The product of its digits is 8164800, while the sum is 52.

The spelling of 673638235153 in words is "six hundred seventy-three billion, six hundred thirty-eight million, two hundred thirty-five thousand, one hundred fifty-three".