1201665169853 has 4 divisors (see below), whose sum is σ = 1201956204540. Its totient is φ = 1201374135168.

The previous prime is 1201665169847. The next prime is 1201665169877. The reversal of 1201665169853 is 3589615661021.

It is a happy number.

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 260526534724 + 941138635129 = 510418^2 + 970123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201665169853 - 2¹⁶ = 1201665104317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201665169795 and 1201665169804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201665169823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145511150 + ... + 145519407.

It is an arithmetic number, because the mean of its divisors is an integer number (300489051135).

Almost surely, 2^{1201665169853} is an apocalyptic number.

It is an amenable number.

1201665169853 is a deficient number, since it is larger than the sum of its proper divisors (291034687).

1201665169853 is an equidigital number, since it uses as much as digits as its factorization.

1201665169853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291034686.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 1201665169853 in words is "one trillion, two hundred one billion, six hundred sixty-five million, one hundred sixty-nine thousand, eight hundred fifty-three".