1256532128166 has 32 divisors (see below), whose sum is σ = 3041018933760. Its totient is φ = 337890992256.

The previous prime is 1256532128153. The next prime is 1256532128207. The reversal of 1256532128166 is 6618212356521.

It is a super-3 number, since 3×1256532128166³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 879923746 + ... + 879925173.

It is an arithmetic number, because the mean of its divisors is an integer number (95031841680).

Almost surely, 2^{1256532128166} is an apocalyptic number.

1256532128166 is an abundant number, since it is smaller than the sum of its proper divisors (1784486805594).

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

1256532128166 is a wasteful number, since it uses less digits than its factorization.

1256532128166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759848948.

The product of its digits is 1036800, while the sum is 48.

The spelling of 1256532128166 in words is "one trillion, two hundred fifty-six billion, five hundred thirty-two million, one hundred twenty-eight thousand, one hundred sixty-six".