1275262661 has 8 divisors (see below), whose sum is σ = 1279749120. Its totient is φ = 1270784592.

The previous prime is 1275262649. The next prime is 1275262699. The reversal of 1275262661 is 1662625721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275262661 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 (1275262621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467660 + ... + 470378.

It is an arithmetic number, because the mean of its divisors is an integer number (159968640).

Almost surely, 2^1275262661 is an apocalyptic number.

It is an amenable number.

1275262661 is a deficient number, since it is larger than the sum of its proper divisors (4486459).

1275262661 is a wasteful number, since it uses less digits than its factorization.

1275262661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195.

The product of its digits is 60480, while the sum is 38.

The square root of 1275262661 is about 35710.8199429809. The cubic root of 1275262661 is about 1084.4258994299.

The spelling of 1275262661 in words is "one billion, two hundred seventy-five million, two hundred sixty-two thousand, six hundred sixty-one".