201619066745 has 4 divisors (see below), whose sum is σ = 241942880100. Its totient is φ = 161295253392.

The previous prime is 201619066721. The next prime is 201619066757. The reversal of 201619066745 is 547660916102.

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 54159994729 + 147459072016 = 232723^2 + 384004^2 .

It is a cyclic number.

It is not a de Polignac number, because 201619066745 - 2⁶ = 201619066681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201619066745.

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, 20161906670 + ... + 20161906679.

It is an arithmetic number, because the mean of its divisors is an integer number (60485720025).

Almost surely, 2^201619066745 is an apocalyptic number.

It is an amenable number.

201619066745 is a deficient number, since it is larger than the sum of its proper divisors (40323813355).

201619066745 is an equidigital number, since it uses as much as digits as its factorization.

201619066745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40323813354.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 201619066745 in words is "two hundred one billion, six hundred nineteen million, sixty-six thousand, seven hundred forty-five".