1155666601 has 4 divisors (see below), whose sum is σ = 1157006592. Its totient is φ = 1154326612.

The previous prime is 1155666563. The next prime is 1155666607. The reversal of 1155666601 is 1066665511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1066665511 = 20747 ⋅51413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155666601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155666607) 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, 668701 + ... + 670426.

It is an arithmetic number, because the mean of its divisors is an integer number (289251648).

Almost surely, 2^1155666601 is an apocalyptic number.

It is an amenable number.

1155666601 is a deficient number, since it is larger than the sum of its proper divisors (1339991).

1155666601 is an equidigital number, since it uses as much as digits as its factorization.

1155666601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339990.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1155666601 is about 33995.0967199683. The cubic root of 1155666601 is about 1049.4075572470.

The spelling of 1155666601 in words is "one billion, one hundred fifty-five million, six hundred sixty-six thousand, six hundred one".