1155268621817 has 4 divisors (see below), whose sum is σ = 1172511437136. Its totient is φ = 1138025806500.

The previous prime is 1155268621757. The next prime is 1155268621823. The reversal of 1155268621817 is 7181268625511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155268621817 - 2¹⁴ = 1155268605433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155268624817) 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, 8621407559 + ... + 8621407692.

It is an arithmetic number, because the mean of its divisors is an integer number (293127859284).

Almost surely, 2^{1155268621817} is an apocalyptic number.

It is an amenable number.

1155268621817 is a deficient number, since it is larger than the sum of its proper divisors (17242815319).

1155268621817 is an equidigital number, since it uses as much as digits as its factorization.

1155268621817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17242815318.

The product of its digits is 1612800, while the sum is 53.

The spelling of 1155268621817 in words is "one trillion, one hundred fifty-five billion, two hundred sixty-eight million, six hundred twenty-one thousand, eight hundred seventeen".