551366650561 has 4 divisors (see below), whose sum is σ = 551368549972. Its totient is φ = 551364751152.

The previous prime is 551366650559. The next prime is 551366650577. The reversal of 551366650561 is 165056663155.

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

It can be written as a sum of positive squares in 2 ways, for example, as 447234587536 + 104132063025 = 668756^2 + 322695^2 .

It is a cyclic number.

It is not a de Polignac number, because 551366650561 - 2¹ = 551366650559 is a prime.

It is a super-2 number, since 2×551366650561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551366650591) 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, 413286 + ... + 1128511.

It is an arithmetic number, because the mean of its divisors is an integer number (137842137493).

Almost surely, 2^551366650561 is an apocalyptic number.

It is an amenable number.

551366650561 is a deficient number, since it is larger than the sum of its proper divisors (1899411).

551366650561 is a wasteful number, since it uses less digits than its factorization.

551366650561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899410.

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 551366650561 in words is "five hundred fifty-one billion, three hundred sixty-six million, six hundred fifty thousand, five hundred sixty-one".