1664796747 has 6 divisors (see below), whose sum is σ = 2219823228. Its totient is φ = 1109817384.

The previous prime is 1664796719. The next prime is 1664796761. The reversal of 1664796747 is 7476974661.

It is not a de Polignac number, because 1664796747 - 2⁷ = 1664796619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664796767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58893 + ... + 82449.

It is an arithmetic number, because the mean of its divisors is an integer number (369970538).

Almost surely, 2^1664796747 is an apocalyptic number.

1664796747 is a deficient number, since it is larger than the sum of its proper divisors (555026481).

1664796747 is an frugal number, since it uses more digits than its factorization.

1664796747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47117 (or 23560 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 57.

The square root of 1664796747 is about 40801.9208739000. The cubic root of 1664796747 is about 1185.1875285833.

The spelling of 1664796747 in words is "one billion, six hundred sixty-four million, seven hundred ninety-six thousand, seven hundred forty-seven".