1260367661 has 6 divisors (see below), whose sum is σ = 1466142030. Its totient is φ = 1080315096.

The previous prime is 1260367649. The next prime is 1260367673. The reversal of 1260367661 is 1667630621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1260367649) and next prime (1260367673).

It can be written as a sum of positive squares in only one way, i.e., 1152602500 + 107765161 = 33950^2 + 10381^2 .

It is not a de Polignac number, because 1260367661 - 2¹⁰ = 1260366637 is a prime.

It is a super-2 number, since 2×1260367661² = 3177053281789221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260367621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12860846 + ... + 12860943.

It is an arithmetic number, because the mean of its divisors is an integer number (244357005).

Almost surely, 2^1260367661 is an apocalyptic number.

It is an amenable number.

1260367661 is a deficient number, since it is larger than the sum of its proper divisors (205774369).

1260367661 is an equidigital number, since it uses as much as digits as its factorization.

1260367661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25721803 (or 25721796 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1260367661 is about 35501.6571585046. The cubic root of 1260367661 is about 1080.1873420436.

The spelling of 1260367661 in words is "one billion, two hundred sixty million, three hundred sixty-seven thousand, six hundred sixty-one".