1265690061 has 12 divisors (see below), whose sum is σ = 1844399388. Its totient is φ = 836325504.

The previous prime is 1265690057. The next prime is 1265690077. The reversal of 1265690061 is 1600965621.

It can be written as a sum of positive squares in 2 ways, for example, as 31573161 + 1234116900 = 5619^2 + 35130^2 .

It is not a de Polignac number, because 1265690061 - 2² = 1265690057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1265689998 and 1265690025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265690051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621250 + ... + 623283.

It is an arithmetic number, because the mean of its divisors is an integer number (153699949).

Almost surely, 2^1265690061 is an apocalyptic number.

It is an amenable number.

1265690061 is a deficient number, since it is larger than the sum of its proper divisors (578709327).

1265690061 is a wasteful number, since it uses less digits than its factorization.

1265690061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244652 (or 1244649 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1265690061 is about 35576.5380693513. The cubic root of 1265690061 is about 1081.7057125634.

The spelling of 1265690061 in words is "one billion, two hundred sixty-five million, six hundred ninety thousand, sixty-one".