551213453545 has 4 divisors (see below), whose sum is σ = 661456144260. Its totient is φ = 440970762832.

The previous prime is 551213453519. The next prime is 551213453551. The reversal of 551213453545 is 545354312155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545354312155 = 5 ⋅109070862431.

It can be written as a sum of positive squares in 2 ways, for example, as 222801936361 + 328411517184 = 472019^2 + 573072^2 .

It is a cyclic number.

It is not a de Polignac number, because 551213453545 - 2¹³ = 551213445353 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55121345350 + ... + 55121345359.

It is an arithmetic number, because the mean of its divisors is an integer number (165364036065).

Almost surely, 2^551213453545 is an apocalyptic number.

It is an amenable number.

551213453545 is a deficient number, since it is larger than the sum of its proper divisors (110242690715).

551213453545 is a wasteful number, since it uses less digits than its factorization.

551213453545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110242690714.

The product of its digits is 900000, while the sum is 43.

The spelling of 551213453545 in words is "five hundred fifty-one billion, two hundred thirteen million, four hundred fifty-three thousand, five hundred forty-five".