1679999945 has 8 divisors (see below), whose sum is σ = 2171076936. Its totient is φ = 1240615296.

The previous prime is 1679999917. The next prime is 1679999947. The reversal of 1679999945 is 5499999761.

It can be written as a sum of positive squares in 4 ways, for example, as 112869376 + 1567130569 = 10624^2 + 39587^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1679999945 - 2¹⁰ = 1679998921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679999947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12923012 + ... + 12923141.

It is an arithmetic number, because the mean of its divisors is an integer number (271384617).

Almost surely, 2^1679999945 is an apocalyptic number.

It is an amenable number.

1679999945 is a deficient number, since it is larger than the sum of its proper divisors (491076991).

1679999945 is a wasteful number, since it uses less digits than its factorization.

1679999945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25846171.

The product of its digits is 49601160, while the sum is 68.

The square root of 1679999945 is about 40987.8023929071. The cubic root of 1679999945 is about 1188.7843775798.

The spelling of 1679999945 in words is "one billion, six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred forty-five".