278579865983 has 4 divisors (see below), whose sum is σ = 281135644680. Its totient is φ = 276024087288.

The previous prime is 278579865953. The next prime is 278579866003. The reversal of 278579865983 is 389568975872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278579865983 - 2⁸ = 278579865727 is a prime.

It is a super-2 number, since 2×278579865983² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278579865913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277889185 + ... + 1277889402.

It is an arithmetic number, because the mean of its divisors is an integer number (70283911170).

Almost surely, 2^278579865983 is an apocalyptic number.

278579865983 is a deficient number, since it is larger than the sum of its proper divisors (2555778697).

278579865983 is a wasteful number, since it uses less digits than its factorization.

278579865983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555778696.

The product of its digits is 1828915200, while the sum is 77.

The spelling of 278579865983 in words is "two hundred seventy-eight billion, five hundred seventy-nine million, eight hundred sixty-five thousand, nine hundred eighty-three".