551646801949 has 4 divisors (see below), whose sum is σ = 575631445536. Its totient is φ = 527662158364.

The previous prime is 551646801947. The next prime is 551646801973. The reversal of 551646801949 is 949108646155.

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.

It is a cyclic number.

It is not a de Polignac number, because 551646801949 - 2¹ = 551646801947 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551646801893 and 551646801902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551646801941) 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, 11992321759 + ... + 11992321804.

It is an arithmetic number, because the mean of its divisors is an integer number (143907861384).

Almost surely, 2^551646801949 is an apocalyptic number.

It is an amenable number.

551646801949 is a deficient number, since it is larger than the sum of its proper divisors (23984643587).

551646801949 is a wasteful number, since it uses less digits than its factorization.

551646801949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23984643586.

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 551646801949 in words is "five hundred fifty-one billion, six hundred forty-six million, eight hundred one thousand, nine hundred forty-nine".