1121551265665 has 8 divisors (see below), whose sum is σ = 1348035773760. Its totient is φ = 895791509232.

The previous prime is 1121551265623. The next prime is 1121551265669. The reversal of 1121551265665 is 5665621551211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121551265665 - 2⁷ = 1121551265537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121551265669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181184509 + ... + 181190698.

It is an arithmetic number, because the mean of its divisors is an integer number (168504471720).

Almost surely, 2^{1121551265665} is an apocalyptic number.

It is an amenable number.

1121551265665 is a deficient number, since it is larger than the sum of its proper divisors (226484508095).

1121551265665 is an equidigital number, since it uses as much as digits as its factorization.

1121551265665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362375831.

The product of its digits is 540000, while the sum is 46.

The spelling of 1121551265665 in words is "one trillion, one hundred twenty-one billion, five hundred fifty-one million, two hundred sixty-five thousand, six hundred sixty-five".