166555501550511 has 32 divisors (see below), whose sum is σ = 224587779010560. Its totient is φ = 109786754220000.

The previous prime is 166555501550497. The next prime is 166555501550569. The reversal of 166555501550511 is 115055105555661.

It is not a de Polignac number, because 166555501550511 - 2¹³ = 166555501542319 is a prime.

It is a super-3 number, since 3×166555501550511³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166555501550611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 993310666 + ... + 993478328.

It is an arithmetic number, because the mean of its divisors is an integer number (7018368094080).

Almost surely, 2^{166555501550511} is an apocalyptic number.

166555501550511 is a deficient number, since it is larger than the sum of its proper divisors (58032277460049).

166555501550511 is a wasteful number, since it uses less digits than its factorization.

166555501550511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177547.

The product of its (nonzero) digits is 2812500, while the sum is 51.

The spelling of 166555501550511 in words is "one hundred sixty-six trillion, five hundred fifty-five billion, five hundred one million, five hundred fifty thousand, five hundred eleven".