209549840891453 has 16 divisors (see below), whose sum is σ = 233748468944640. Its totient is φ = 186687628416000.

The previous prime is 209549840891431. The next prime is 209549840891477. The reversal of 209549840891453 is 354198048945902.

It is a cyclic number.

It is not a de Polignac number, because 209549840891453 - 2¹⁴ = 209549840875069 is a prime.

It is a super-2 number, since 2×209549840891453² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209549840801453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269704133 + ... + 270479978.

It is an arithmetic number, because the mean of its divisors is an integer number (14609279309040).

Almost surely, 2^{209549840891453} is an apocalyptic number.

It is an amenable number.

209549840891453 is a deficient number, since it is larger than the sum of its proper divisors (24198628053187).

209549840891453 is a wasteful number, since it uses less digits than its factorization.

209549840891453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540185348.

The product of its (nonzero) digits is 447897600, while the sum is 71.

The spelling of 209549840891453 in words is "two hundred nine trillion, five hundred forty-nine billion, eight hundred forty million, eight hundred ninety-one thousand, four hundred fifty-three".