278421543513 has 8 divisors (see below), whose sum is σ = 412476360800. Its totient is φ = 185614362324.

The previous prime is 278421543509. The next prime is 278421543529. The reversal of 278421543513 is 315345124872.

278421543513 is a `hidden beast` number, since 2 + 7 + 84 + 2 + 1 + 54 + 3 + 513 = 666.

It is not a de Polignac number, because 278421543513 - 2² = 278421543509 is a prime.

It is a super-2 number, since 2×278421543513² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278421543593) 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 7 ways as a sum of consecutive naturals, for example, 5155954483 + ... + 5155954536.

It is an arithmetic number, because the mean of its divisors is an integer number (51559545100).

Almost surely, 2^278421543513 is an apocalyptic number.

It is an amenable number.

278421543513 is a deficient number, since it is larger than the sum of its proper divisors (134054817287).

278421543513 is a wasteful number, since it uses less digits than its factorization.

278421543513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10311909028 (or 10311909022 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 278421543513 in words is "two hundred seventy-eight billion, four hundred twenty-one million, five hundred forty-three thousand, five hundred thirteen".