1365778881697 has 4 divisors (see below), whose sum is σ = 1365781473280. Its totient is φ = 1365776290116.

The previous prime is 1365778881653. The next prime is 1365778881767. The reversal of 1365778881697 is 7961888775631.

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 1365778881697 - 2³¹ = 1363631398049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1365778881497) 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, 191697 + ... + 1663822.

It is an arithmetic number, because the mean of its divisors is an integer number (341445368320).

Almost surely, 2^{1365778881697} is an apocalyptic number.

It is an amenable number.

1365778881697 is a deficient number, since it is larger than the sum of its proper divisors (2591583).

1365778881697 is an equidigital number, since it uses as much as digits as its factorization.

1365778881697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591582.

The product of its digits is 853493760, while the sum is 76.

The spelling of 1365778881697 in words is "one trillion, three hundred sixty-five billion, seven hundred seventy-eight million, eight hundred eighty-one thousand, six hundred ninety-seven".