1366871617 has 4 divisors (see below), whose sum is σ = 1378967940. Its totient is φ = 1354775296.

The previous prime is 1366871603. The next prime is 1366871629. The reversal of 1366871617 is 7161786631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7161786631 = 3733 ⋅1918507.

It can be written as a sum of positive squares in 2 ways, for example, as 635493681 + 731377936 = 25209^2 + 27044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366871617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366871687) 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, 6047992 + ... + 6048217.

It is an arithmetic number, because the mean of its divisors is an integer number (344741985).

Almost surely, 2^1366871617 is an apocalyptic number.

It is an amenable number.

1366871617 is a deficient number, since it is larger than the sum of its proper divisors (12096323).

1366871617 is a wasteful number, since it uses less digits than its factorization.

1366871617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12096322.

The product of its digits is 254016, while the sum is 46.

The square root of 1366871617 is about 36971.2268798318. The cubic root of 1366871617 is about 1109.7945178710.

The spelling of 1366871617 in words is "one billion, three hundred sixty-six million, eight hundred seventy-one thousand, six hundred seventeen".