451212121212155 has 4 divisors (see below), whose sum is σ = 541454545454592. Its totient is φ = 360969696969720.

The previous prime is 451212121212121. The next prime is 451212121212247. The reversal of 451212121212155 is 551212121212154.

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

It is not a de Polignac number, because 451212121212155 - 2⁴⁸ = 169737144501499 is a prime.

It is a super-2 number, since 2×451212121212155² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45121212121211 + ... + 45121212121220.

It is an arithmetic number, because the mean of its divisors is an integer number (135363636363648).

Almost surely, 2^{451212121212155} is an apocalyptic number.

451212121212155 is a deficient number, since it is larger than the sum of its proper divisors (90242424242437).

451212121212155 is an equidigital number, since it uses as much as digits as its factorization.

451212121212155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90242424242436.

The product of its digits is 16000, while the sum is 35.

Subtracting 451212121212155 from its reverse (551212121212154), we obtain a palindrome (99999999999999).

The spelling of 451212121212155 in words is "four hundred fifty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred fifty-five".