1966764623 has 4 divisors (see below), whose sum is σ = 1999006728. Its totient is φ = 1934522520.

The previous prime is 1966764619. The next prime is 1966764641. The reversal of 1966764623 is 3264676691.

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 1966764623 - 2² = 1966764619 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 (1966764673) 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, 16120961 + ... + 16121082.

It is an arithmetic number, because the mean of its divisors is an integer number (499751682).

Almost surely, 2^1966764623 is an apocalyptic number.

1966764623 is a deficient number, since it is larger than the sum of its proper divisors (32242105).

1966764623 is an equidigital number, since it uses as much as digits as its factorization.

1966764623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32242104.

The product of its digits is 1959552, while the sum is 50.

The square root of 1966764623 is about 44348.2200657478. The cubic root of 1966764623 is about 1252.9030389127.

The spelling of 1966764623 in words is "one billion, nine hundred sixty-six million, seven hundred sixty-four thousand, six hundred twenty-three".