1966585099 has 4 divisors (see below), whose sum is σ = 2030023360. Its totient is φ = 1903146840.

The previous prime is 1966585021. The next prime is 1966585147. The reversal of 1966585099 is 9905856691.

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 1966585099 - 2²³ = 1958196491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966585009) 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, 31719084 + ... + 31719145.

It is an arithmetic number, because the mean of its divisors is an integer number (507505840).

Almost surely, 2^1966585099 is an apocalyptic number.

1966585099 is a deficient number, since it is larger than the sum of its proper divisors (63438261).

1966585099 is an equidigital number, since it uses as much as digits as its factorization.

1966585099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63438260.

The product of its (nonzero) digits is 5248800, while the sum is 58.

The square root of 1966585099 is about 44346.1959924411. The cubic root of 1966585099 is about 1252.8649165727.

The spelling of 1966585099 in words is "one billion, nine hundred sixty-six million, five hundred eighty-five thousand, ninety-nine".