555000001561 has 4 divisors (see below), whose sum is σ = 555036246400. Its totient is φ = 554963756724.

The previous prime is 555000001499. The next prime is 555000001649. The reversal of 555000001561 is 165100000555.

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 555000001561 - 2¹¹ = 554999999513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555000901561) 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 3 ways as a sum of consecutive naturals, for example, 18099441 + ... + 18130078.

It is an arithmetic number, because the mean of its divisors is an integer number (138759061600).

Almost surely, 2^555000001561 is an apocalyptic number.

It is an amenable number.

555000001561 is a deficient number, since it is larger than the sum of its proper divisors (36244839).

555000001561 is a wasteful number, since it uses less digits than its factorization.

555000001561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36244838.

The product of its (nonzero) digits is 3750, while the sum is 28.

The spelling of 555000001561 in words is "five hundred fifty-five billion, one thousand, five hundred sixty-one".