1366121919 has 8 divisors (see below), whose sum is σ = 1880253952. Its totient is φ = 881368920.

The previous prime is 1366121909. The next prime is 1366121947. The reversal of 1366121919 is 9191216631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1366121919 - 2¹¹ = 1366119871 is a prime.

It is a super-2 number, since 2×1366121919² = 3732578195144485122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366121909) 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, 7344649 + ... + 7344834.

It is an arithmetic number, because the mean of its divisors is an integer number (235031744).

Almost surely, 2^1366121919 is an apocalyptic number.

1366121919 is a deficient number, since it is larger than the sum of its proper divisors (514132033).

1366121919 is a wasteful number, since it uses less digits than its factorization.

1366121919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14689517.

The product of its digits is 17496, while the sum is 39.

The square root of 1366121919 is about 36961.0865505872. The cubic root of 1366121919 is about 1109.5915817455.

The spelling of 1366121919 in words is "one billion, three hundred sixty-six million, one hundred twenty-one thousand, nine hundred nineteen".