1664304345 has 96 divisors (see below), whose sum is σ = 3275251200. Its totient is φ = 774412800.

The previous prime is 1664304331. The next prime is 1664304353. The reversal of 1664304345 is 5434034661.

1664304345 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 304 + 345 = 666.

It is not a de Polignac number, because 1664304345 - 2⁴ = 1664304329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3861280 + ... + 3861710.

It is an arithmetic number, because the mean of its divisors is an integer number (34117200).

Almost surely, 2^1664304345 is an apocalyptic number.

1664304345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664304345 is a deficient number, since it is larger than the sum of its proper divisors (1610946855).

1664304345 is a wasteful number, since it uses less digits than its factorization.

1664304345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 1664304345 is about 40795.8863735058. The cubic root of 1664304345 is about 1185.0706682205.

It can be divided in two parts, 16 and 64304345, that added together give a square (64304361 = 8019²).

The spelling of 1664304345 in words is "one billion, six hundred sixty-four million, three hundred four thousand, three hundred forty-five".