262721728768249 has 9 divisors (see below), whose sum is σ = 263422914448197. Its totient is φ = 262022404708764.

The previous prime is 262721728768243. The next prime is 262721728768267. The reversal of 262721728768249 is 942867827127262.

The square root of 262721728768249 is 16208693.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 262721728768249 - 2³ = 262721728768241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (262721728768241) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6143073264 + ... + 6143116030.

Almost surely, 2^{262721728768249} is an apocalyptic number.

262721728768249 is the 16208693-rd square number.

262721728768249 is the 8104347-th centered octagonal number.

It is an amenable number.

262721728768249 is a deficient number, since it is larger than the sum of its proper divisors (701185679948).

262721728768249 is an frugal number, since it uses more digits than its factorization.

262721728768249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86292 (or 43146 counting only the distinct ones).

The product of its digits is 910393344, while the sum is 73.

The spelling of 262721728768249 in words is "two hundred sixty-two trillion, seven hundred twenty-one billion, seven hundred twenty-eight million, seven hundred sixty-eight thousand, two hundred forty-nine".