1256660461 has 8 divisors (see below), whose sum is σ = 1450127744. Its totient is φ = 1066679280.

The previous prime is 1256660459. The next prime is 1256660467. The reversal of 1256660461 is 1640666521.

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

It is a cyclic number.

It is not a de Polignac number, because 1256660461 - 2¹ = 1256660459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256660461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256660467) 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 7 ways as a sum of consecutive naturals, for example, 870750 + ... + 872191.

It is an arithmetic number, because the mean of its divisors is an integer number (181265968).

Almost surely, 2^1256660461 is an apocalyptic number.

It is an amenable number.

1256660461 is a deficient number, since it is larger than the sum of its proper divisors (193467283).

1256660461 is a wasteful number, since it uses less digits than its factorization.

1256660461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743051.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1256660461 is about 35449.4070613318. The cubic root of 1256660461 is about 1079.1272272669.

The spelling of 1256660461 in words is "one billion, two hundred fifty-six million, six hundred sixty thousand, four hundred sixty-one".