1664735074 has 4 divisors (see below), whose sum is σ = 2497102614. Its totient is φ = 832367536.

The previous prime is 1664735063. The next prime is 1664735077. The reversal of 1664735074 is 4705374661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1393902225 + 270832849 = 37335^2 + 16457^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1664735074.

It is not an unprimeable number, because it can be changed into a prime (1664735077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416183767 + ... + 416183770.

Almost surely, 2^1664735074 is an apocalyptic number.

1664735074 is a deficient number, since it is larger than the sum of its proper divisors (832367540).

1664735074 is an equidigital number, since it uses as much as digits as its factorization.

1664735074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832367539.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 1664735074 is about 40801.1651059133. The cubic root of 1664735074 is about 1185.1728931685.

The spelling of 1664735074 in words is "one billion, six hundred sixty-four million, seven hundred thirty-five thousand, seventy-four".