1155216333509 has 12 divisors (see below), whose sum is σ = 1344006806688. Its totient is φ = 990050052600.

The previous prime is 1155216333493. The next prime is 1155216333529. The reversal of 1155216333509 is 9053336125511.

It is a happy number.

It is not a de Polignac number, because 1155216333509 - 2⁴ = 1155216333493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155216333509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155216333529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1248737 + ... + 1967174.

It is an arithmetic number, because the mean of its divisors is an integer number (112000567224).

Almost surely, 2^{1155216333509} is an apocalyptic number.

It is an amenable number.

1155216333509 is a deficient number, since it is larger than the sum of its proper divisors (188790473179).

1155216333509 is an equidigital number, since it uses as much as digits as its factorization.

1155216333509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223256 (or 3223249 counting only the distinct ones).

The product of its (nonzero) digits is 364500, while the sum is 44.

The spelling of 1155216333509 in words is "one trillion, one hundred fifty-five billion, two hundred sixteen million, three hundred thirty-three thousand, five hundred nine".