1778693940241 has 4 divisors (see below), whose sum is σ = 1872309410800. Its totient is φ = 1685078469684.

The previous prime is 1778693940209. The next prime is 1778693940263. The reversal of 1778693940241 is 1420493968771.

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 not a de Polignac number, because 1778693940241 - 2⁵ = 1778693940209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1778693940241.

It is not an unprimeable number, because it can be changed into a prime (1778693940341) 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, 46807735251 + ... + 46807735288.

It is an arithmetic number, because the mean of its divisors is an integer number (468077352700).

Almost surely, 2^{1778693940241} is an apocalyptic number.

It is an amenable number.

1778693940241 is a deficient number, since it is larger than the sum of its proper divisors (93615470559).

1778693940241 is an equidigital number, since it uses as much as digits as its factorization.

1778693940241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93615470558.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 1778693940241 in words is "one trillion, seven hundred seventy-eight billion, six hundred ninety-three million, nine hundred forty thousand, two hundred forty-one".