278755875561 has 16 divisors (see below), whose sum is σ = 375610868864. Its totient is φ = 183870134784.

The previous prime is 278755875553. The next prime is 278755875569. The reversal of 278755875561 is 165578557872.

It is an interprime number because it is at equal distance from previous prime (278755875553) and next prime (278755875569).

It is not a de Polignac number, because 278755875561 - 2³ = 278755875553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 278755875492 and 278755875501.

It is not an unprimeable number, because it can be changed into a prime (278755875569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 926676 + ... + 1190058.

It is an arithmetic number, because the mean of its divisors is an integer number (23475679304).

Almost surely, 2^278755875561 is an apocalyptic number.

It is an amenable number.

278755875561 is a deficient number, since it is larger than the sum of its proper divisors (96854993303).

278755875561 is a wasteful number, since it uses less digits than its factorization.

278755875561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267120.

The product of its digits is 164640000, while the sum is 66.

The spelling of 278755875561 in words is "two hundred seventy-eight billion, seven hundred fifty-five million, eight hundred seventy-five thousand, five hundred sixty-one".