15555206161 has 4 divisors (see below), whose sum is σ = 16969315824. Its totient is φ = 14141096500.

The previous prime is 15555206137. The next prime is 15555206171. The reversal of 15555206161 is 16160255551.

15555206161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15555206161 - 2⁵ = 15555206129 is a prime.

It is a super-2 number, since 2×15555206161² (a number of 21 digits) contains 22 as substring.

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 15555206161.

It is not an unprimeable number, because it can be changed into a prime (15555206101) 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, 707054815 + ... + 707054836.

It is an arithmetic number, because the mean of its divisors is an integer number (4242328956).

Almost surely, 2^15555206161 is an apocalyptic number.

15555206161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15555206161 is a deficient number, since it is larger than the sum of its proper divisors (1414109663).

15555206161 is a wasteful number, since it uses less digits than its factorization.

15555206161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414109662.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 15555206161 in words is "fifteen billion, five hundred fifty-five million, two hundred six thousand, one hundred sixty-one".