1966761438583 has 4 divisors (see below), whose sum is σ = 2000096378280. Its totient is φ = 1933426498888.

The previous prime is 1966761438557. The next prime is 1966761438589. The reversal of 1966761438583 is 3858341676691.

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

It is a cyclic number.

It is not a de Polignac number, because 1966761438583 - 2¹³ = 1966761430391 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966761438589) 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, 16667469760 + ... + 16667469877.

It is an arithmetic number, because the mean of its divisors is an integer number (500024094570).

Almost surely, 2^{1966761438583} is an apocalyptic number.

1966761438583 is a deficient number, since it is larger than the sum of its proper divisors (33334939697).

1966761438583 is an equidigital number, since it uses as much as digits as its factorization.

1966761438583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33334939696.

The product of its digits is 156764160, while the sum is 67.

The spelling of 1966761438583 in words is "one trillion, nine hundred sixty-six billion, seven hundred sixty-one million, four hundred thirty-eight thousand, five hundred eighty-three".