551663471521 has 8 divisors (see below), whose sum is σ = 575856198144. Its totient is φ = 527488024800.

The previous prime is 551663471509. The next prime is 551663471549. The reversal of 551663471521 is 125174366155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 551663471521 - 2³⁷ = 414224518049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551663471221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254705 + ... + 4382446.

It is an arithmetic number, because the mean of its divisors is an integer number (71982024768).

Almost surely, 2^551663471521 is an apocalyptic number.

It is an amenable number.

551663471521 is a deficient number, since it is larger than the sum of its proper divisors (24192726623).

551663471521 is a wasteful number, since it uses less digits than its factorization.

551663471521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8639951.

The product of its digits is 756000, while the sum is 46.

The spelling of 551663471521 in words is "five hundred fifty-one billion, six hundred sixty-three million, four hundred seventy-one thousand, five hundred twenty-one".