653613442121 has 4 divisors (see below), whose sum is σ = 664328416644. Its totient is φ = 642898467600.

The previous prime is 653613442109. The next prime is 653613442123. The reversal of 653613442121 is 121244316356.

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 17328036496 + 636285405625 = 131636^2 + 797675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653613442121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653613442123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5357487170 + ... + 5357487291.

It is an arithmetic number, because the mean of its divisors is an integer number (166082104161).

Almost surely, 2^653613442121 is an apocalyptic number.

653613442121 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

653613442121 is a deficient number, since it is larger than the sum of its proper divisors (10714974523).

653613442121 is a wasteful number, since it uses less digits than its factorization.

653613442121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10714974522.

The product of its digits is 103680, while the sum is 38.

Adding to 653613442121 its reverse (121244316356), we get a palindrome (774857758477).

The spelling of 653613442121 in words is "six hundred fifty-three billion, six hundred thirteen million, four hundred forty-two thousand, one hundred twenty-one".