278056676618887 has 4 divisors (see below), whose sum is σ = 278056799076880. Its totient is φ = 278056554160896.

The previous prime is 278056676618879. The next prime is 278056676618911. The reversal of 278056676618887 is 788816676650872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278056676618887 - 2³ = 278056676618879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278056676118887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57757443 + ... + 62386180.

It is an arithmetic number, because the mean of its divisors is an integer number (69514199769220).

Almost surely, 2^{278056676618887} is an apocalyptic number.

278056676618887 is a deficient number, since it is larger than the sum of its proper divisors (122457993).

278056676618887 is a wasteful number, since it uses less digits than its factorization.

278056676618887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122457992.

The product of its (nonzero) digits is 18207866880, while the sum is 85.

The spelling of 278056676618887 in words is "two hundred seventy-eight trillion, fifty-six billion, six hundred seventy-six million, six hundred eighteen thousand, eight hundred eighty-seven".