278942857951 has 8 divisors (see below), whose sum is σ = 280670189744. Its totient is φ = 277215721920.

The previous prime is 278942857933. The next prime is 278942858011. The reversal of 278942857951 is 159758249872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 278942857951 - 2¹¹ = 278942855903 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 (278942857651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3688915 + ... + 3763771.

It is an arithmetic number, because the mean of its divisors is an integer number (35083773718).

Almost surely, 2^278942857951 is an apocalyptic number.

278942857951 is a deficient number, since it is larger than the sum of its proper divisors (1727331793).

278942857951 is a wasteful number, since it uses less digits than its factorization.

278942857951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97881.

The product of its digits is 101606400, while the sum is 67.

The spelling of 278942857951 in words is "two hundred seventy-eight billion, nine hundred forty-two million, eight hundred fifty-seven thousand, nine hundred fifty-one".