278455680739 has 2 divisors, whose sum is σ = 278455680740. Its totient is φ = 278455680738.

The previous prime is 278455680709. The next prime is 278455680823. The reversal of 278455680739 is 937086554872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278455680739 - 2⁵ = 278455680707 is a prime.

It is a super-2 number, since 2×278455680739² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278455680709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139227840369 + 139227840370.

It is an arithmetic number, because the mean of its divisors is an integer number (139227840370).

Almost surely, 2^278455680739 is an apocalyptic number.

278455680739 is a deficient number, since it is larger than the sum of its proper divisors (1).

278455680739 is an equidigital number, since it uses as much as digits as its factorization.

278455680739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 278455680739 in words is "two hundred seventy-eight billion, four hundred fifty-five million, six hundred eighty thousand, seven hundred thirty-nine".