1781141256677 has 8 divisors (see below), whose sum is σ = 1786045777152. Its totient is φ = 1776237015600.

The previous prime is 1781141256659. The next prime is 1781141256691. The reversal of 1781141256677 is 7766521411871.

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 1781141256677 - 2⁶ = 1781141256613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781141256617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25413152 + ... + 25483142.

It is an arithmetic number, because the mean of its divisors is an integer number (223255722144).

Almost surely, 2^{1781141256677} is an apocalyptic number.

It is an amenable number.

1781141256677 is a deficient number, since it is larger than the sum of its proper divisors (4904520475).

1781141256677 is an equidigital number, since it uses as much as digits as its factorization.

1781141256677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139699.

The product of its digits is 3951360, while the sum is 56.

The spelling of 1781141256677 in words is "one trillion, seven hundred eighty-one billion, one hundred forty-one million, two hundred fifty-six thousand, six hundred seventy-seven".