555161660161 has 8 divisors (see below), whose sum is σ = 556859201000. Its totient is φ = 553466597760.

The previous prime is 555161660159. The next prime is 555161660171. The reversal of 555161660161 is 161066161555.

It can be written as a sum of positive squares in 4 ways, for example, as 53217025 + 555108443136 = 7295^2 + 745056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 555161660161 - 2¹ = 555161660159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555161660171) 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, 170436 + ... + 1067413.

It is an arithmetic number, because the mean of its divisors is an integer number (69607400125).

Almost surely, 2^555161660161 is an apocalyptic number.

It is an amenable number.

555161660161 is a deficient number, since it is larger than the sum of its proper divisors (1697540839).

555161660161 is a wasteful number, since it uses less digits than its factorization.

555161660161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239219.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 555161660161 in words is "five hundred fifty-five billion, one hundred sixty-one million, six hundred sixty thousand, one hundred sixty-one".