1155780645 has 32 divisors (see below), whose sum is σ = 1928171520. Its totient is φ = 590446080.

The previous prime is 1155780623. The next prime is 1155780667. The reversal of 1155780645 is 5460875511.

It is an interprime number because it is at equal distance from previous prime (1155780623) and next prime (1155780667).

It is not a de Polignac number, because 1155780645 - 2⁸ = 1155780389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155780597 and 1155780606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44785 + ... + 65705.

It is an arithmetic number, because the mean of its divisors is an integer number (60255360).

Almost surely, 2^1155780645 is an apocalyptic number.

1155780645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1155780645 is a deficient number, since it is larger than the sum of its proper divisors (772390875).

1155780645 is a wasteful number, since it uses less digits than its factorization.

1155780645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21085.

The product of its (nonzero) digits is 168000, while the sum is 42.

The square root of 1155780645 is about 33996.7740381349. The cubic root of 1155780645 is about 1049.4420754777.

The spelling of 1155780645 in words is "one billion, one hundred fifty-five million, seven hundred eighty thousand, six hundred forty-five".