1263160661 has 6 divisors (see below), whose sum is σ = 1469391030. Its totient is φ = 1082709096.

The previous prime is 1263160643. The next prime is 1263160663. The reversal of 1263160661 is 1660613621.

It can be written as a sum of positive squares in only one way, i.e., 934463761 + 328696900 = 30569^2 + 18130^2 .

It is not a de Polignac number, because 1263160661 - 2⁶ = 1263160597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263160663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12889346 + ... + 12889443.

It is an arithmetic number, because the mean of its divisors is an integer number (244898505).

Almost surely, 2^1263160661 is an apocalyptic number.

It is an amenable number.

1263160661 is a deficient number, since it is larger than the sum of its proper divisors (206230369).

1263160661 is an equidigital number, since it uses as much as digits as its factorization.

1263160661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25778803 (or 25778796 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1263160661 is about 35540.9715821051. The cubic root of 1263160661 is about 1080.9846589771.

The spelling of 1263160661 in words is "one billion, two hundred sixty-three million, one hundred sixty thousand, six hundred sixty-one".