1256261445528 has 32 divisors (see below), whose sum is σ = 3140787183360. Its totient is φ = 418736005920.

The previous prime is 1256261445497. The next prime is 1256261445533. The reversal of 1256261445528 is 8255441626521.

It is a super-2 number, since 2×1256261445528² (a number of 25 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 530788 + ... + 1671603.

It is an arithmetic number, because the mean of its divisors is an integer number (98149599480).

Almost surely, 2^{1256261445528} is an apocalyptic number.

It is an amenable number.

1256261445528 is an abundant number, since it is smaller than the sum of its proper divisors (1884525737832).

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

1256261445528 is a wasteful number, since it uses less digits than its factorization.

1256261445528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226167 (or 2226163 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 51.

The spelling of 1256261445528 in words is "one trillion, two hundred fifty-six billion, two hundred sixty-one million, four hundred forty-five thousand, five hundred twenty-eight".