1256170542361 has 8 divisors (see below), whose sum is σ = 1469010069824. Its totient is φ = 1051677663120.

The previous prime is 1256170542323. The next prime is 1256170542379. The reversal of 1256170542361 is 1632450716521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256170542361 - 2⁷ = 1256170542233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256170542061) 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, 2086661730 + ... + 2086662331.

It is an arithmetic number, because the mean of its divisors is an integer number (183626258728).

Almost surely, 2^{1256170542361} is an apocalyptic number.

It is an amenable number.

1256170542361 is a deficient number, since it is larger than the sum of its proper divisors (212839527463).

1256170542361 is an equidigital number, since it uses as much as digits as its factorization.

1256170542361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173324111.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 1256170542361 in words is "one trillion, two hundred fifty-six billion, one hundred seventy million, five hundred forty-two thousand, three hundred sixty-one".