555081207561 has 8 divisors (see below), whose sum is σ = 822342529760. Its totient is φ = 370054138356.

The previous prime is 555081207509. The next prime is 555081207661. The reversal of 555081207561 is 165702180555.

555081207561 is a `hidden beast` number, since 5 + 5 + 5 + 0 + 81 + 2 + 0 + 7 + 561 = 666.

It is not a de Polignac number, because 555081207561 - 2²³ = 555072818953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555081207061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10279281595 + ... + 10279281648.

It is an arithmetic number, because the mean of its divisors is an integer number (102792816220).

Almost surely, 2^555081207561 is an apocalyptic number.

It is an amenable number.

555081207561 is a deficient number, since it is larger than the sum of its proper divisors (267261322199).

555081207561 is a wasteful number, since it uses less digits than its factorization.

555081207561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20558563252 (or 20558563246 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 45.

The spelling of 555081207561 in words is "five hundred fifty-five billion, eighty-one million, two hundred seven thousand, five hundred sixty-one".