1155780668 has 12 divisors (see below), whose sum is σ = 2311561392. Its totient is φ = 495334560.

The previous prime is 1155780667. The next prime is 1155780707. The reversal of 1155780668 is 8660875511.

It is a happy number.

1155780668 is an admirable number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155780667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20638913 + ... + 20638968.

It is an arithmetic number, because the mean of its divisors is an integer number (192630116).

Almost surely, 2^1155780668 is an apocalyptic number.

It is an amenable number.

1155780668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1155780668 is a wasteful number, since it uses less digits than its factorization.

1155780668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41277892 (or 41277890 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 1155780668 is about 33996.7743764022. The cubic root of 1155780668 is about 1049.4420824390.

The spelling of 1155780668 in words is "one billion, one hundred fifty-five million, seven hundred eighty thousand, six hundred sixty-eight".