1156065666 has 64 divisors (see below), whose sum is σ = 2746856448. Its totient is φ = 317469888.

The previous prime is 1156065661. The next prime is 1156065689. The reversal of 1156065666 is 6665606511.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1156065661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124501 + ... + 133463.

It is an arithmetic number, because the mean of its divisors is an integer number (42919632).

Almost surely, 2^1156065666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156065666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1373428224).

1156065666 is an abundant number, since it is smaller than the sum of its proper divisors (1590790782).

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

1156065666 is a wasteful number, since it uses less digits than its factorization.

1156065666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9095.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1156065666 is about 34000.9656627573. The cubic root of 1156065666 is about 1049.5283341886.

The spelling of 1156065666 in words is "one billion, one hundred fifty-six million, sixty-five thousand, six hundred sixty-six".