1366017821 has 16 divisors (see below), whose sum is σ = 1623321600. Its totient is φ = 1124807040.

The previous prime is 1366017773. The next prime is 1366017833. The reversal of 1366017821 is 1287106631.

It is not a de Polignac number, because 1366017821 - 2¹⁴ = 1366001437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366017841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6755 + ... + 52703.

It is an arithmetic number, because the mean of its divisors is an integer number (101457600).

Almost surely, 2^1366017821 is an apocalyptic number.

It is an amenable number.

1366017821 is a deficient number, since it is larger than the sum of its proper divisors (257303779).

1366017821 is a wasteful number, since it uses less digits than its factorization.

1366017821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46124.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1366017821 is about 36959.6783129940. The cubic root of 1366017821 is about 1109.5633975362.

The spelling of 1366017821 in words is "one billion, three hundred sixty-six million, seventeen thousand, eight hundred twenty-one".