1366416641 has 4 divisors (see below), whose sum is σ = 1371860784. Its totient is φ = 1360972500.

The previous prime is 1366416631. The next prime is 1366416671. The reversal of 1366416641 is 1466146631.

It is a happy number.

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 1366416641 - 2²⁶ = 1299307777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1366416595 and 1366416604.

It is not an unprimeable number, because it can be changed into a prime (1366416631) 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, 2721695 + ... + 2722196.

It is an arithmetic number, because the mean of its divisors is an integer number (342965196).

Almost surely, 2^1366416641 is an apocalyptic number.

It is an amenable number.

1366416641 is a deficient number, since it is larger than the sum of its proper divisors (5444143).

1366416641 is an equidigital number, since it uses as much as digits as its factorization.

1366416641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444142.

The product of its digits is 62208, while the sum is 38.

The square root of 1366416641 is about 36965.0732584152. The cubic root of 1366416641 is about 1109.6713690450.

The spelling of 1366416641 in words is "one billion, three hundred sixty-six million, four hundred sixteen thousand, six hundred forty-one".