278658454157 has 2 divisors, whose sum is σ = 278658454158. Its totient is φ = 278658454156.

The previous prime is 278658454079. The next prime is 278658454213. The reversal of 278658454157 is 751454856872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177703559401 + 100954894756 = 421549^2 + 317734^2 .

It is a cyclic number.

It is not a de Polignac number, because 278658454157 - 2⁸ = 278658453901 is a prime.

It is a super-3 number, since 3×278658454157³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 278658454157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278658451157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139329227078 + 139329227079.

It is an arithmetic number, because the mean of its divisors is an integer number (139329227079).

Almost surely, 2^278658454157 is an apocalyptic number.

It is an amenable number.

278658454157 is a deficient number, since it is larger than the sum of its proper divisors (1).

278658454157 is an equidigital number, since it uses as much as digits as its factorization.

278658454157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264000, while the sum is 62.

The spelling of 278658454157 in words is "two hundred seventy-eight billion, six hundred fifty-eight million, four hundred fifty-four thousand, one hundred fifty-seven".