20225665406451 has 4 divisors (see below), whose sum is σ = 26967553875272. Its totient is φ = 13483776937632.

The previous prime is 20225665406447. The next prime is 20225665406459. The reversal of 20225665406451 is 15460456652202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20225665406451 - 2² = 20225665406447 is a prime.

It is a super-2 number, since 2×20225665406451² (a number of 27 digits) contains 22 as substring.

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 20225665406451.

It is not an unprimeable number, because it can be changed into a prime (20225665406459) 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, 3370944234406 + ... + 3370944234411.

It is an arithmetic number, because the mean of its divisors is an integer number (6741888468818).

Almost surely, 2^{20225665406451} is an apocalyptic number.

20225665406451 is a deficient number, since it is larger than the sum of its proper divisors (6741888468821).

20225665406451 is an equidigital number, since it uses as much as digits as its factorization.

20225665406451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6741888468820.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 20225665406451 in words is "twenty trillion, two hundred twenty-five billion, six hundred sixty-five million, four hundred six thousand, four hundred fifty-one".