551021646457 has 4 divisors (see below), whose sum is σ = 551779586176. Its totient is φ = 550263706740.

The previous prime is 551021646449. The next prime is 551021646479. The reversal of 551021646457 is 754646120155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754646120155 = 5 ⋅150929224031.

It is a cyclic number.

It is not a de Polignac number, because 551021646457 - 2³ = 551021646449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551021646437) by changing a digit.

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, 378968769 + ... + 378970222.

It is an arithmetic number, because the mean of its divisors is an integer number (137944896544).

Almost surely, 2^551021646457 is an apocalyptic number.

It is an amenable number.

551021646457 is a deficient number, since it is larger than the sum of its proper divisors (757939719).

551021646457 is an equidigital number, since it uses as much as digits as its factorization.

551021646457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757939718.

The product of its (nonzero) digits is 1008000, while the sum is 46.

The spelling of 551021646457 in words is "five hundred fifty-one billion, twenty-one million, six hundred forty-six thousand, four hundred fifty-seven".