551100005561 has 24 divisors (see below), whose sum is σ = 673378694784. Its totient is φ = 448841131200.

The previous prime is 551100005537. The next prime is 551100005567. The reversal of 551100005561 is 165500001155.

It is a happy number.

It is not a de Polignac number, because 551100005561 - 2¹⁸ = 551099743417 is a prime.

It is a super-2 number, since 2×551100005561² (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 (551100005567) 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 23 ways as a sum of consecutive naturals, for example, 1449020 + ... + 1789373.

It is an arithmetic number, because the mean of its divisors is an integer number (28057445616).

Almost surely, 2^551100005561 is an apocalyptic number.

It is an amenable number.

551100005561 is a deficient number, since it is larger than the sum of its proper divisors (122278689223).

551100005561 is a wasteful number, since it uses less digits than its factorization.

551100005561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3238581 (or 3238574 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 551100005561 in words is "five hundred fifty-one billion, one hundred million, five thousand, five hundred sixty-one".