201918691723 has 6 divisors (see below), whose sum is σ = 234885008796. Its totient is φ = 173073164292.

The previous prime is 201918691721. The next prime is 201918691771. The reversal of 201918691723 is 327196819102.

It is a happy number.

201918691723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201918691723 - 2¹ = 201918691721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 4120789627 = 201918691723 / (2 + 0 + 1 + 9 + 1 + 8 + 6 + 9 + 1 + 7 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201918691721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2060394765 + ... + 2060394862.

It is an arithmetic number, because the mean of its divisors is an integer number (39147501466).

Almost surely, 2^201918691723 is an apocalyptic number.

201918691723 is a deficient number, since it is larger than the sum of its proper divisors (32966317073).

201918691723 is an equidigital number, since it uses as much as digits as its factorization.

201918691723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120789641 (or 4120789634 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The spelling of 201918691723 in words is "two hundred one billion, nine hundred eighteen million, six hundred ninety-one thousand, seven hundred twenty-three".