1781848615361 has 8 divisors (see below), whose sum is σ = 1887160190760. Its totient is φ = 1676592256768.

The previous prime is 1781848615333. The next prime is 1781848615363. The reversal of 1781848615361 is 1635168481871.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 455700603136 + 1326148012225 = 675056^2 + 1151585^2 .

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 1781848615361 - 2²² = 1781844421057 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 1781848615361.

It is not an unprimeable number, because it can be changed into a prime (1781848615363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13737746 + ... + 13866843.

It is an arithmetic number, because the mean of its divisors is an integer number (235895023845).

Almost surely, 2^{1781848615361} is an apocalyptic number.

It is an amenable number.

1781848615361 is a deficient number, since it is larger than the sum of its proper divisors (105311575399).

1781848615361 is a wasteful number, since it uses less digits than its factorization.

1781848615361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27608403.

The product of its digits is 7741440, while the sum is 59.

The spelling of 1781848615361 in words is "one trillion, seven hundred eighty-one billion, eight hundred forty-eight million, six hundred fifteen thousand, three hundred sixty-one".