1155346423778 has 16 divisors (see below), whose sum is σ = 1750968726360. Its totient is φ = 571690745856.

The previous prime is 1155346423697. The next prime is 1155346423789. The reversal of 1155346423778 is 8773246435511.

It can be written as a sum of positive squares in 4 ways, for example, as 1043264088409 + 112082335369 = 1021403^2 + 334787^2 .

It is a super-4 number, since 4×1155346423778⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon 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, 4331138 + ... + 4590146.

Almost surely, 2^{1155346423778} is an apocalyptic number.

1155346423778 is a deficient number, since it is larger than the sum of its proper divisors (595622302582).

1155346423778 is a wasteful number, since it uses less digits than its factorization.

1155346423778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282101.

The product of its digits is 16934400, while the sum is 56.

The spelling of 1155346423778 in words is "one trillion, one hundred fifty-five billion, three hundred forty-six million, four hundred twenty-three thousand, seven hundred seventy-eight".