1366140123665 has 16 divisors (see below), whose sum is σ = 1782715128912. Its totient is φ = 1000822523904.

The previous prime is 1366140123641. The next prime is 1366140123679. The reversal of 1366140123665 is 5663210416631.

It can be written as a sum of positive squares in 8 ways, for example, as 468666206464 + 897473917201 = 684592^2 + 947351^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366140123665 - 2¹⁴ = 1366140107281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217189244 + ... + 217195533.

It is an arithmetic number, because the mean of its divisors is an integer number (111419695557).

Almost surely, 2^{1366140123665} is an apocalyptic number.

It is an amenable number.

1366140123665 is a deficient number, since it is larger than the sum of its proper divisors (416575005247).

1366140123665 is a wasteful number, since it uses less digits than its factorization.

1366140123665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434384836.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 1366140123665 in words is "one trillion, three hundred sixty-six billion, one hundred forty million, one hundred twenty-three thousand, six hundred sixty-five".