20312651012461 has 8 divisors (see below), whose sum is σ = 21013140043800. Its totient is φ = 19612165500480.

The previous prime is 20312651012453. The next prime is 20312651012477. The reversal of 20312651012461 is 16421015621302.

It can be written as a sum of positive squares in 4 ways, for example, as 98464164100 + 20214186848361 = 313790^2 + 4496019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20312651012461 - 2³ = 20312651012453 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 (20312651012491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17068831 + ... + 18220051.

It is an arithmetic number, because the mean of its divisors is an integer number (2626642505475).

Almost surely, 2^{20312651012461} is an apocalyptic number.

It is an amenable number.

20312651012461 is a deficient number, since it is larger than the sum of its proper divisors (700489031339).

20312651012461 is a wasteful number, since it uses less digits than its factorization.

20312651012461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759679.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 20312651012461 its reverse (16421015621302), we get a palindrome (36733666633763).

The spelling of 20312651012461 in words is "twenty trillion, three hundred twelve billion, six hundred fifty-one million, twelve thousand, four hundred sixty-one".