505551100561 has 16 divisors (see below), whose sum is σ = 578762247168. Its totient is φ = 437461920000.

The previous prime is 505551100553. The next prime is 505551100633. The reversal of 505551100561 is 165001155505.

It is a cyclic number.

It is not a de Polignac number, because 505551100561 - 2³ = 505551100553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505551100511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4501425 + ... + 4612366.

It is an arithmetic number, because the mean of its divisors is an integer number (36172640448).

Almost surely, 2^505551100561 is an apocalyptic number.

It is an amenable number.

505551100561 is a deficient number, since it is larger than the sum of its proper divisors (73211146607).

505551100561 is a wasteful number, since it uses less digits than its factorization.

505551100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9114072.

The product of its (nonzero) digits is 18750, while the sum is 34.

The spelling of 505551100561 in words is "five hundred five billion, five hundred fifty-one million, one hundred thousand, five hundred sixty-one".