274643998549 has 2 divisors, whose sum is σ = 274643998550. Its totient is φ = 274643998548.

The previous prime is 274643998547. The next prime is 274643998589. The reversal of 274643998549 is 945899346472.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274633643025 + 10355524 = 524055^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 274643998549 - 2¹ = 274643998547 is a prime.

It is a super-2 number, since 2×274643998549² (a number of 24 digits) contains 22 as substring.

Together with 274643998547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (274643998543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137321999274 + 137321999275.

It is an arithmetic number, because the mean of its divisors is an integer number (137321999275).

Almost surely, 2^274643998549 is an apocalyptic number.

It is an amenable number.

274643998549 is a deficient number, since it is larger than the sum of its proper divisors (1).

274643998549 is an equidigital number, since it uses as much as digits as its factorization.

274643998549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 70.

The spelling of 274643998549 in words is "two hundred seventy-four billion, six hundred forty-three million, nine hundred ninety-eight thousand, five hundred forty-nine".