1161556006665 has 32 divisors (see below), whose sum is σ = 1868378006016. Its totient is φ = 616201297920.

The previous prime is 1161556006627. The next prime is 1161556006697. The reversal of 1161556006665 is 5666006551611.

It is not a de Polignac number, because 1161556006665 - 2⁹ = 1161556006153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24644752 + ... + 24691838.

It is an arithmetic number, because the mean of its divisors is an integer number (58386812688).

Almost surely, 2^{1161556006665} is an apocalyptic number.

1161556006665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161556006665 is a deficient number, since it is larger than the sum of its proper divisors (706821999351).

1161556006665 is a wasteful number, since it uses less digits than its factorization.

1161556006665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55809.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1161556006665 in words is "one trillion, one hundred sixty-one billion, five hundred fifty-six million, six thousand, six hundred sixty-five".