1366650374621 has 4 divisors (see below), whose sum is σ = 1561886142432. Its totient is φ = 1171414606812.

The previous prime is 1366650374599. The next prime is 1366650374627. The reversal of 1366650374621 is 1264730566631.

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 1366650374621 - 2¹⁰ = 1366650373597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366650374621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366650374627) 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, 97617883895 + ... + 97617883908.

It is an arithmetic number, because the mean of its divisors is an integer number (390471535608).

Almost surely, 2^{1366650374621} is an apocalyptic number.

It is an amenable number.

1366650374621 is a deficient number, since it is larger than the sum of its proper divisors (195235767811).

1366650374621 is an equidigital number, since it uses as much as digits as its factorization.

1366650374621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195235767810.

The product of its (nonzero) digits is 3265920, while the sum is 50.

The spelling of 1366650374621 in words is "one trillion, three hundred sixty-six billion, six hundred fifty million, three hundred seventy-four thousand, six hundred twenty-one".