1155319720164 has 27 divisors (see below), whose sum is σ = 2920407816963. Its totient is φ = 385104423672.

The previous prime is 1155319720153. The next prime is 1155319720187. The reversal of 1155319720164 is 4610279135511.

The square root of 1155319720164 is 1074858.

It is a perfect power (a square), and thus also a powerful number.

1155319720164 is a `hidden beast` number, since 1 + 1 + 5 + 531 + 97 + 20 + 1 + 6 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6359577 + ... + 6538719.

Almost surely, 2^{1155319720164} is an apocalyptic number.

1155319720164 is the 1074858-th square number.

It is an amenable number.

1155319720164 is an abundant number, since it is smaller than the sum of its proper divisors (1765088096799).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155319720164 is an frugal number, since it uses more digits than its factorization.

1155319720164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358296 (or 179148 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 1155319720164 in words is "one trillion, one hundred fifty-five billion, three hundred nineteen million, seven hundred twenty thousand, one hundred sixty-four".