1256212401787 has 8 divisors (see below), whose sum is σ = 1435681030400. Its totient is φ = 1076746201704.

The previous prime is 1256212401713. The next prime is 1256212401827. The reversal of 1256212401787 is 7871042126521.

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 1256212401787 - 2⁷ = 1256212401659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256212401187) 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, 684514 + ... + 1726552.

It is an arithmetic number, because the mean of its divisors is an integer number (179460128800).

Almost surely, 2^{1256212401787} is an apocalyptic number.

1256212401787 is a deficient number, since it is larger than the sum of its proper divisors (179468628613).

1256212401787 is a wasteful number, since it uses less digits than its factorization.

1256212401787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214265.

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 1256212401787 in words is "one trillion, two hundred fifty-six billion, two hundred twelve million, four hundred one thousand, seven hundred eighty-seven".