55166500161 has 12 divisors (see below), whose sum is σ = 82432701780. Its totient is φ = 35509471200.

The previous prime is 55166500159. The next prime is 55166500163. The reversal of 55166500161 is 16100566155.

It is an interprime number because it is at equal distance from previous prime (55166500159) and next prime (55166500163).

It can be written as a sum of positive squares in 2 ways, for example, as 44548434225 + 10618065936 = 211065^2 + 103044^2 .

It is not a de Polignac number, because 55166500161 - 2¹ = 55166500159 is a prime.

It is a super-2 number, since 2×55166500161² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55166500163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105682690 + ... + 105683211.

It is an arithmetic number, because the mean of its divisors is an integer number (6869391815).

Almost surely, 2^55166500161 is an apocalyptic number.

It is an amenable number.

55166500161 is a deficient number, since it is larger than the sum of its proper divisors (27266201619).

55166500161 is a wasteful number, since it uses less digits than its factorization.

55166500161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211365936 (or 211365933 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 55166500161 in words is "fifty-five billion, one hundred sixty-six million, five hundred thousand, one hundred sixty-one".