278783172543 has 8 divisors (see below), whose sum is σ = 381757137328. Its totient is φ = 180832328064.

The previous prime is 278783172509. The next prime is 278783172553. The reversal of 278783172543 is 345271387872.

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

It is not a de Polignac number, because 278783172543 - 2¹³ = 278783164351 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 (278783172553) 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, 1255779946 + ... + 1255780167.

It is an arithmetic number, because the mean of its divisors is an integer number (47719642166).

Almost surely, 2^278783172543 is an apocalyptic number.

278783172543 is a deficient number, since it is larger than the sum of its proper divisors (102973964785).

278783172543 is a wasteful number, since it uses less digits than its factorization.

278783172543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511560153.

The product of its digits is 15805440, while the sum is 57.

The spelling of 278783172543 in words is "two hundred seventy-eight billion, seven hundred eighty-three million, one hundred seventy-two thousand, five hundred forty-three".