551021646454 has 4 divisors (see below), whose sum is σ = 826532469684. Its totient is φ = 275510823226.

The previous prime is 551021646449. The next prime is 551021646479. The reversal of 551021646454 is 454646120155.

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

It is a self number, because there is not a number n which added to its sum of digits gives 551021646454.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 137755411612 + ... + 137755411615.

It is an arithmetic number, because the mean of its divisors is an integer number (206633117421).

Almost surely, 2^551021646454 is an apocalyptic number.

551021646454 is a deficient number, since it is larger than the sum of its proper divisors (275510823230).

551021646454 is a wasteful number, since it uses less digits than its factorization.

551021646454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275510823229.

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 551021646454 in words is "five hundred fifty-one billion, twenty-one million, six hundred forty-six thousand, four hundred fifty-four".