1256170542420 has 48 divisors (see below), whose sum is σ = 3670202632320. Its totient is φ = 320414514816.

The previous prime is 1256170542409. The next prime is 1256170542457. The reversal of 1256170542420 is 242450716521.

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, 455132875 + ... + 455135634.

It is an arithmetic number, because the mean of its divisors is an integer number (76462554840).

Almost surely, 2^{1256170542420} is an apocalyptic number.

1256170542420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256170542420 is an abundant number, since it is smaller than the sum of its proper divisors (2414032089900).

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

1256170542420 is a wasteful number, since it uses less digits than its factorization.

1256170542420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910268544 (or 910268542 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 1256170542420 in words is "one trillion, two hundred fifty-six billion, one hundred seventy million, five hundred forty-two thousand, four hundred twenty".