1260675661 has 4 divisors (see below), whose sum is σ = 1440772192. Its totient is φ = 1080579132.

The previous prime is 1260675653. The next prime is 1260675671. The reversal of 1260675661 is 1665760621.

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: 1665760621 = 7 ⋅237965803.

It is a cyclic number.

It is not a de Polignac number, because 1260675661 - 2³ = 1260675653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260675641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90048255 + ... + 90048268.

It is an arithmetic number, because the mean of its divisors is an integer number (360193048).

Almost surely, 2^1260675661 is an apocalyptic number.

It is an amenable number.

1260675661 is a deficient number, since it is larger than the sum of its proper divisors (180096531).

1260675661 is an equidigital number, since it uses as much as digits as its factorization.

1260675661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180096530.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 1260675661 is about 35505.9947192020. The cubic root of 1260675661 is about 1080.2753244672.

The spelling of 1260675661 in words is "one billion, two hundred sixty million, six hundred seventy-five thousand, six hundred sixty-one".