278611047381 has 16 divisors (see below), whose sum is σ = 377072789184. Its totient is φ = 182958284544.

The previous prime is 278611047373. The next prime is 278611047457. The reversal of 278611047381 is 183740116872.

It is not a de Polignac number, because 278611047381 - 2³ = 278611047373 is a prime.

It is a super-2 number, since 2×278611047381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 278611047381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278611047311) 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 15 ways as a sum of consecutive naturals, for example, 1576206 + ... + 1744031.

It is an arithmetic number, because the mean of its divisors is an integer number (23567049324).

Almost surely, 2^278611047381 is an apocalyptic number.

It is an amenable number.

278611047381 is a deficient number, since it is larger than the sum of its proper divisors (98461741803).

278611047381 is a wasteful number, since it uses less digits than its factorization.

278611047381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320660.

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 278611047381 in words is "two hundred seventy-eight billion, six hundred eleven million, forty-seven thousand, three hundred eighty-one".