20451101610551 has 4 divisors (see below), whose sum is σ = 20456306781600. Its totient is φ = 20445896439504.

The previous prime is 20451101610523. The next prime is 20451101610553. The reversal of 20451101610551 is 15501610115402.

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

It is a cyclic number.

It is not a de Polignac number, because 20451101610551 - 2²² = 20451097416247 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 (20451101610553) 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, 2602579631 + ... + 2602587488.

It is an arithmetic number, because the mean of its divisors is an integer number (5114076695400).

Almost surely, 2^{20451101610551} is an apocalyptic number.

20451101610551 is a deficient number, since it is larger than the sum of its proper divisors (5205171049).

20451101610551 is an equidigital number, since it uses as much as digits as its factorization.

20451101610551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5205171048.

The product of its (nonzero) digits is 6000, while the sum is 32.

Adding to 20451101610551 its reverse (15501610115402), we get a palindrome (35952711725953).

The spelling of 20451101610551 in words is "twenty trillion, four hundred fifty-one billion, one hundred one million, six hundred ten thousand, five hundred fifty-one".