551110100561 has 4 divisors (see below), whose sum is σ = 551113446324. Its totient is φ = 551106754800.

The previous prime is 551110100551. The next prime is 551110100641. The reversal of 551110100561 is 165001011155.

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 163907571025 + 387202529536 = 404855^2 + 622256^2 .

It is a cyclic number.

It is not a de Polignac number, because 551110100561 - 2¹⁸ = 551109838417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551110100561.

It is not an unprimeable number, because it can be changed into a prime (551110100551) 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, 1412270 + ... + 1759751.

It is an arithmetic number, because the mean of its divisors is an integer number (137778361581).

Almost surely, 2^551110100561 is an apocalyptic number.

It is an amenable number.

551110100561 is a deficient number, since it is larger than the sum of its proper divisors (3345763).

551110100561 is a wasteful number, since it uses less digits than its factorization.

551110100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345762.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 551110100561 in words is "five hundred fifty-one billion, one hundred ten million, one hundred thousand, five hundred sixty-one".