101555666165 has 4 divisors (see below), whose sum is σ = 121866799404. Its totient is φ = 81244532928.

The previous prime is 101555666129. The next prime is 101555666203. The reversal of 101555666165 is 561666555101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31457279044 + 70098387121 = 177362^2 + 264761^2 .

It is a cyclic number.

It is not a de Polignac number, because 101555666165 - 2⁸ = 101555665909 is a prime.

It is a super-3 number, since 3×101555666165³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10155566612 + ... + 10155566621.

It is an arithmetic number, because the mean of its divisors is an integer number (30466699851).

Almost surely, 2^101555666165 is an apocalyptic number.

It is an amenable number.

101555666165 is a deficient number, since it is larger than the sum of its proper divisors (20311133239).

101555666165 is an equidigital number, since it uses as much as digits as its factorization.

101555666165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20311133238.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 101555666165 in words is "one hundred one billion, five hundred fifty-five million, six hundred sixty-six thousand, one hundred sixty-five".