1966994735533 has 4 divisors (see below), whose sum is σ = 1971949382620. Its totient is φ = 1962040088448.

The previous prime is 1966994735513. The next prime is 1966994735567. The reversal of 1966994735533 is 3355374996691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1400916061609 + 566078673924 = 1183603^2 + 752382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966994735533 - 2⁹ = 1966994735021 is a prime.

It is a super-2 number, since 2×1966994735533² (a number of 25 digits) 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 (1966994735513) 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, 2477322948 + ... + 2477323741.

It is an arithmetic number, because the mean of its divisors is an integer number (492987345655).

Almost surely, 2^{1966994735533} is an apocalyptic number.

It is an amenable number.

1966994735533 is a deficient number, since it is larger than the sum of its proper divisors (4954647087).

1966994735533 is an equidigital number, since it uses as much as digits as its factorization.

1966994735533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954647086.

The product of its digits is 496011600, while the sum is 70.

It can be divided in two parts, 1966 and 994735533, that added together give a palindrome (994737499).

The spelling of 1966994735533 in words is "one trillion, nine hundred sixty-six billion, nine hundred ninety-four million, seven hundred thirty-five thousand, five hundred thirty-three".