1155221663455 has 8 divisors (see below), whose sum is σ = 1387339796304. Its totient is φ = 923461464000.

The previous prime is 1155221663411. The next prime is 1155221663467. The reversal of 1155221663455 is 5543661225511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155221663455 - 2⁷ = 1155221663327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89476246 + ... + 89489155.

It is an arithmetic number, because the mean of its divisors is an integer number (173417474538).

Almost surely, 2^{1155221663455} is an apocalyptic number.

1155221663455 is a deficient number, since it is larger than the sum of its proper divisors (232118132849).

1155221663455 is a wasteful number, since it uses less digits than its factorization.

1155221663455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178966697.

The product of its digits is 1080000, while the sum is 46.

Adding to 1155221663455 its reverse (5543661225511), we get a palindrome (6698882888966).

The spelling of 1155221663455 in words is "one trillion, one hundred fifty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred fifty-five".