1078878993449 has 2 divisors, whose sum is σ = 1078878993450. Its totient is φ = 1078878993448.

The previous prime is 1078878993373. The next prime is 1078878993503. The reversal of 1078878993449 is 9443998788701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635795727424 + 443083266025 = 797368^2 + 665645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1078878993449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1078878993449.

It is not a weakly prime, because it can be changed into another prime (1078878983449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539439496724 + 539439496725.

It is an arithmetic number, because the mean of its divisors is an integer number (539439496725).

Almost surely, 2^{1078878993449} is an apocalyptic number.

It is an amenable number.

1078878993449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078878993449 is an equidigital number, since it uses as much as digits as its factorization.

1078878993449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 877879296, while the sum is 77.

The spelling of 1078878993449 in words is "one trillion, seventy-eight billion, eight hundred seventy-eight million, nine hundred ninety-three thousand, four hundred forty-nine".