166015553565 has 8 divisors (see below), whose sum is σ = 265624885728. Its totient is φ = 88541628560.

The previous prime is 166015553551. The next prime is 166015553579. The reversal of 166015553565 is 565355510661.

It is an interprime number because it is at equal distance from previous prime (166015553551) and next prime (166015553579).

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

It is not a de Polignac number, because 166015553565 - 2⁷ = 166015553437 is a prime.

It is a super-2 number, since 2×166015553565² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5533851771 + ... + 5533851800.

It is an arithmetic number, because the mean of its divisors is an integer number (33203110716).

Almost surely, 2^166015553565 is an apocalyptic number.

166015553565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166015553565 is a deficient number, since it is larger than the sum of its proper divisors (99609332163).

166015553565 is a wasteful number, since it uses less digits than its factorization.

166015553565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11067703579.

The product of its (nonzero) digits is 2025000, while the sum is 48.

The spelling of 166015553565 in words is "one hundred sixty-six billion, fifteen million, five hundred fifty-three thousand, five hundred sixty-five".