1256788995885 has 48 divisors (see below), whose sum is σ = 2205425371968. Its totient is φ = 661987968000.

The previous prime is 1256788995851. The next prime is 1256788995887. The reversal of 1256788995885 is 5885998876521.

1256788995885 is a `hidden beast` number, since 1 + 25 + 6 + 7 + 8 + 8 + 9 + 9 + 588 + 5 = 666.

It is not a de Polignac number, because 1256788995885 - 2¹³ = 1256788987693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256788995887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11302810 + ... + 11413460.

It is an arithmetic number, because the mean of its divisors is an integer number (45946361916).

Almost surely, 2^{1256788995885} is an apocalyptic number.

1256788995885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256788995885 is a deficient number, since it is larger than the sum of its proper divisors (948636376083).

1256788995885 is a wasteful number, since it uses less digits than its factorization.

1256788995885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113786 (or 113783 counting only the distinct ones).

The product of its digits is 3483648000, while the sum is 81.

The spelling of 1256788995885 in words is "one trillion, two hundred fifty-six billion, seven hundred eighty-eight million, nine hundred ninety-five thousand, eight hundred eighty-five".