20966942165 has 8 divisors (see below), whose sum is σ = 27095740728. Its totient is φ = 15483280320.

The previous prime is 20966942141. The next prime is 20966942177. The reversal of 20966942165 is 56124966902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2324589796 + 18642352369 = 48214^2 + 136537^2 .

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

It is not a de Polignac number, because 20966942165 - 2¹⁰ = 20966941141 is a prime.

It is a super-2 number, since 2×20966942165² (a number of 21 digits) contains 22 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 7 ways as a sum of consecutive naturals, for example, 161284106 + ... + 161284235.

It is an arithmetic number, because the mean of its divisors is an integer number (3386967591).

Almost surely, 2^20966942165 is an apocalyptic number.

It is an amenable number.

20966942165 is a deficient number, since it is larger than the sum of its proper divisors (6128798563).

20966942165 is a wasteful number, since it uses less digits than its factorization.

20966942165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322568359.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 20966942165 in words is "twenty billion, nine hundred sixty-six million, nine hundred forty-two thousand, one hundred sixty-five".