20516225514461 has 4 divisors (see below), whose sum is σ = 20524692799392. Its totient is φ = 20507758229532.

The previous prime is 20516225514443. The next prime is 20516225514487. The reversal of 20516225514461 is 16441552261502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20516225514461 - 2¹⁴ = 20516225498077 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 (20516225514361) 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, 4233638831 + ... + 4233643676.

It is an arithmetic number, because the mean of its divisors is an integer number (5131173199848).

Almost surely, 2^{20516225514461} is an apocalyptic number.

It is an amenable number.

20516225514461 is a deficient number, since it is larger than the sum of its proper divisors (8467284931).

20516225514461 is an equidigital number, since it uses as much as digits as its factorization.

20516225514461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8467284930.

The product of its (nonzero) digits is 576000, while the sum is 44.

Adding to 20516225514461 its reverse (16441552261502), we get a palindrome (36957777775963).

The spelling of 20516225514461 in words is "twenty trillion, five hundred sixteen billion, two hundred twenty-five million, five hundred fourteen thousand, four hundred sixty-one".