1966521313 has 4 divisors (see below), whose sum is σ = 2008362240. Its totient is φ = 1924680388.

The previous prime is 1966521311. The next prime is 1966521329. The reversal of 1966521313 is 3131256691.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1966521313 - 2¹ = 1966521311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966521311) 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, 20920393 + ... + 20920486.

It is an arithmetic number, because the mean of its divisors is an integer number (502090560).

Almost surely, 2^1966521313 is an apocalyptic number.

It is an amenable number.

1966521313 is a deficient number, since it is larger than the sum of its proper divisors (41840927).

1966521313 is an equidigital number, since it uses as much as digits as its factorization.

1966521313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41840926.

The product of its digits is 29160, while the sum is 37.

The square root of 1966521313 is about 44345.4768042920. The cubic root of 1966521313 is about 1252.8513709082.

The spelling of 1966521313 in words is "one billion, nine hundred sixty-six million, five hundred twenty-one thousand, three hundred thirteen".