278549377655 has 16 divisors (see below), whose sum is σ = 342349161984. Its totient is φ = 217490257920.

The previous prime is 278549377651. The next prime is 278549377663. The reversal of 278549377655 is 556773945872.

It is not a de Polignac number, because 278549377655 - 2² = 278549377651 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 (278549377651) 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, 2701034 + ... + 2802263.

It is an arithmetic number, because the mean of its divisors is an integer number (21396822624).

Almost surely, 2^278549377655 is an apocalyptic number.

278549377655 is a deficient number, since it is larger than the sum of its proper divisors (63799784329).

278549377655 is a wasteful number, since it uses less digits than its factorization.

278549377655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503546.

The product of its digits is 444528000, while the sum is 68.

The spelling of 278549377655 in words is "two hundred seventy-eight billion, five hundred forty-nine million, three hundred seventy-seven thousand, six hundred fifty-five".