1780866061241 has 4 divisors (see below), whose sum is σ = 1781528835072. Its totient is φ = 1780203287412.

The previous prime is 1780866061229. The next prime is 1780866061349. The reversal of 1780866061241 is 1421606680871.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1780866061241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1780866061241.

It is not an unprimeable number, because it can be changed into a prime (1780866061441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331382885 + ... + 331388258.

It is an arithmetic number, because the mean of its divisors is an integer number (445382208768).

Almost surely, 2^{1780866061241} is an apocalyptic number.

It is an amenable number.

1780866061241 is a deficient number, since it is larger than the sum of its proper divisors (662773831).

1780866061241 is an equidigital number, since it uses as much as digits as its factorization.

1780866061241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662773830.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 1780866061241 in words is "one trillion, seven hundred eighty billion, eight hundred sixty-six million, sixty-one thousand, two hundred forty-one".