681125453233 has 4 divisors (see below), whose sum is σ = 688147365220. Its totient is φ = 674103541248.

The previous prime is 681125453219. The next prime is 681125453237. The reversal of 681125453233 is 332354521186.

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 309972789504 + 371152663729 = 556752^2 + 609223^2 .

It is a cyclic number.

It is not a de Polignac number, because 681125453233 - 2⁵ = 681125453201 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 681125453233.

It is not an unprimeable number, because it can be changed into a prime (681125453237) 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, 3510955848 + ... + 3510956041.

It is an arithmetic number, because the mean of its divisors is an integer number (172036841305).

Almost surely, 2^681125453233 is an apocalyptic number.

It is an amenable number.

681125453233 is a deficient number, since it is larger than the sum of its proper divisors (7021911987).

681125453233 is an equidigital number, since it uses as much as digits as its factorization.

681125453233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021911986.

The product of its digits is 518400, while the sum is 43.

The spelling of 681125453233 in words is "six hundred eighty-one billion, one hundred twenty-five million, four hundred fifty-three thousand, two hundred thirty-three".