278381262349 has 4 divisors (see below), whose sum is σ = 278501828220. Its totient is φ = 278260696480.

The previous prime is 278381262343. The next prime is 278381262359. The reversal of 278381262349 is 943262183872.

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 142483600900 + 135897661449 = 377470^2 + 368643^2 .

It is a cyclic number.

It is not a de Polignac number, because 278381262349 - 2²⁵ = 278347707917 is a prime.

It is a super-2 number, since 2×278381262349² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 278381262349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278381262343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60279472 + ... + 60284089.

It is an arithmetic number, because the mean of its divisors is an integer number (69625457055).

Almost surely, 2^278381262349 is an apocalyptic number.

It is an amenable number.

278381262349 is a deficient number, since it is larger than the sum of its proper divisors (120565871).

278381262349 is a wasteful number, since it uses less digits than its factorization.

278381262349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120565870.

The product of its digits is 6967296, while the sum is 55.

The spelling of 278381262349 in words is "two hundred seventy-eight billion, three hundred eighty-one million, two hundred sixty-two thousand, three hundred forty-nine".