1366653623 has 4 divisors (see below), whose sum is σ = 1413779640. Its totient is φ = 1319527608.

The previous prime is 1366653611. The next prime is 1366653643. The reversal of 1366653623 is 3263566631.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1366653623 - 2⁶ = 1366653559 is a prime.

It is a super-2 number, since 2×1366653623² = 3735484250518052258, 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 (1366653643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23562965 + ... + 23563022.

It is an arithmetic number, because the mean of its divisors is an integer number (353444910).

Almost surely, 2^1366653623 is an apocalyptic number.

1366653623 is a deficient number, since it is larger than the sum of its proper divisors (47126017).

1366653623 is an equidigital number, since it uses as much as digits as its factorization.

1366653623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47126016.

The product of its digits is 349920, while the sum is 41.

The square root of 1366653623 is about 36968.2786047714. The cubic root of 1366653623 is about 1109.7355166194.

The spelling of 1366653623 in words is "one billion, three hundred sixty-six million, six hundred fifty-three thousand, six hundred twenty-three".