1966078733 has 4 divisors (see below), whose sum is σ = 1973911968. Its totient is φ = 1958245500.

The previous prime is 1966078727. The next prime is 1966078759. The reversal of 1966078733 is 3378706691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3378706691 = 151 ⋅22375541.

It is a cyclic number.

It is not a de Polignac number, because 1966078733 - 2⁴ = 1966078717 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 (1966278733) 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, 3916241 + ... + 3916742.

It is an arithmetic number, because the mean of its divisors is an integer number (493477992).

Almost surely, 2^1966078733 is an apocalyptic number.

It is an amenable number.

1966078733 is a deficient number, since it is larger than the sum of its proper divisors (7833235).

1966078733 is an equidigital number, since it uses as much as digits as its factorization.

1966078733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7833234.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The square root of 1966078733 is about 44340.4863865971. The cubic root of 1966078733 is about 1252.7573760693.

The spelling of 1966078733 in words is "one billion, nine hundred sixty-six million, seventy-eight thousand, seven hundred thirty-three".