1185881655 has 16 divisors (see below), whose sum is σ = 2168469504. Its totient is φ = 542117280.

The previous prime is 1185881647. The next prime is 1185881681. The reversal of 1185881655 is 5561885811.

It is not a de Polignac number, because 1185881655 - 2³ = 1185881647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5646951 + ... + 5647160.

It is an arithmetic number, because the mean of its divisors is an integer number (135529344).

Almost surely, 2^1185881655 is an apocalyptic number.

1185881655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1185881655 is a deficient number, since it is larger than the sum of its proper divisors (982587849).

1185881655 is a wasteful number, since it uses less digits than its factorization.

1185881655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11294126.

The product of its digits is 384000, while the sum is 48.

The square root of 1185881655 is about 34436.6324573121. The cubic root of 1185881655 is about 1058.4746230584.

The spelling of 1185881655 in words is "one billion, one hundred eighty-five million, eight hundred eighty-one thousand, six hundred fifty-five".