1166555642506 has 16 divisors (see below), whose sum is σ = 1787471481600. Its totient is φ = 570820480128.

The previous prime is 1166555642501. The next prime is 1166555642519. The reversal of 1166555642506 is 6052465556611.

It is not an unprimeable number, because it can be changed into a prime (1166555642501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22139751 + ... + 22192378.

It is an arithmetic number, because the mean of its divisors is an integer number (111716967600).

Almost surely, 2^{1166555642506} is an apocalyptic number.

1166555642506 is a deficient number, since it is larger than the sum of its proper divisors (620915839094).

1166555642506 is a wasteful number, since it uses less digits than its factorization.

1166555642506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44332413.

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 1166555642506 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred forty-two thousand, five hundred six".