1256006466 has 128 divisors (see below), whose sum is σ = 3295918080. Its totient is φ = 349531200.

The previous prime is 1256006459. The next prime is 1256006467. The reversal of 1256006466 is 6646006521.

It is a happy number.

1256006466 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 0 + 0 + 646 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1256006466.

It is not an unprimeable number, because it can be changed into a prime (1256006467) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2401281 + ... + 2401803.

It is an arithmetic number, because the mean of its divisors is an integer number (25749360).

Almost surely, 2^1256006466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256006466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1647959040).

1256006466 is an abundant number, since it is smaller than the sum of its proper divisors (2039911614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256006466 is a wasteful number, since it uses less digits than its factorization.

1256006466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1256006466 is about 35440.1815175938. The cubic root of 1256006466 is about 1078.9399939087.

The spelling of 1256006466 in words is "one billion, two hundred fifty-six million, six thousand, four hundred sixty-six".