19665057165101 has 8 divisors (see below), whose sum is σ = 19739031338520. Its totient is φ = 19591089435712.

The previous prime is 19665057165037. The next prime is 19665057165119. The reversal of 19665057165101 is 10156175056691.

It can be written as a sum of positive squares in 4 ways, for example, as 558113584900 + 19106943580201 = 747070^2 + 4371149^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19665057165101 - 2⁶ = 19665057165037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19665057165121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4548011 + ... + 7746903.

It is an arithmetic number, because the mean of its divisors is an integer number (2467378917315).

Almost surely, 2^{19665057165101} is an apocalyptic number.

It is an amenable number.

19665057165101 is a deficient number, since it is larger than the sum of its proper divisors (73974173419).

19665057165101 is a wasteful number, since it uses less digits than its factorization.

19665057165101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222015.

The product of its (nonzero) digits is 1701000, while the sum is 53.

The spelling of 19665057165101 in words is "nineteen trillion, six hundred sixty-five billion, fifty-seven million, one hundred sixty-five thousand, one hundred one".