1155115388278 has 16 divisors (see below), whose sum is σ = 1808914016736. Its totient is φ = 552169252800.

The previous prime is 1155115388267. The next prime is 1155115388299. The reversal of 1155115388278 is 8728835115511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6208173 + ... + 6391528.

It is an arithmetic number, because the mean of its divisors is an integer number (113057126046).

Almost surely, 2^{1155115388278} is an apocalyptic number.

1155115388278 is a deficient number, since it is larger than the sum of its proper divisors (653798628458).

1155115388278 is a wasteful number, since it uses less digits than its factorization.

1155115388278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12601719.

The product of its digits is 2688000, while the sum is 55.

The spelling of 1155115388278 in words is "one trillion, one hundred fifty-five billion, one hundred fifteen million, three hundred eighty-eight thousand, two hundred seventy-eight".