1966494639 has 16 divisors (see below), whose sum is σ = 2644604928. Its totient is φ = 1299732192.

The previous prime is 1966494631. The next prime is 1966494653. The reversal of 1966494639 is 9364946691.

It is not a de Polignac number, because 1966494639 - 2³ = 1966494631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966494631) 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 15 ways as a sum of consecutive naturals, for example, 193954 + ... + 203840.

It is an arithmetic number, because the mean of its divisors is an integer number (165287808).

Almost surely, 2^1966494639 is an apocalyptic number.

1966494639 is a deficient number, since it is larger than the sum of its proper divisors (678110289).

1966494639 is a wasteful number, since it uses less digits than its factorization.

1966494639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10454.

The product of its digits is 7558272, while the sum is 57.

The square root of 1966494639 is about 44345.1760510656. The cubic root of 1966494639 is about 1252.8457063017.

The spelling of 1966494639 in words is "one billion, nine hundred sixty-six million, four hundred ninety-four thousand, six hundred thirty-nine".