20453030551661 has 4 divisors (see below), whose sum is σ = 20453056237824. Its totient is φ = 20453004865500.

The previous prime is 20453030551651. The next prime is 20453030551663. The reversal of 20453030551661 is 16615503035402.

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 20453030551661 - 2¹⁰ = 20453030550637 is a prime.

It is a super-3 number, since 3×20453030551661³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453030551663) 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, 11609165 + ... + 13254386.

It is an arithmetic number, because the mean of its divisors is an integer number (5113264059456).

Almost surely, 2^{20453030551661} is an apocalyptic number.

It is an amenable number.

20453030551661 is a deficient number, since it is larger than the sum of its proper divisors (25686163).

20453030551661 is an equidigital number, since it uses as much as digits as its factorization.

20453030551661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25686162.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 20453030551661 in words is "twenty trillion, four hundred fifty-three billion, thirty million, five hundred fifty-one thousand, six hundred sixty-one".