1664531464 has 8 divisors (see below), whose sum is σ = 3120996510. Its totient is φ = 832265728.

The previous prime is 1664531447. The next prime is 1664531497. The reversal of 1664531464 is 4641354661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1525527364 + 139004100 = 39058^2 + 11790^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104033209 + ... + 104033224.

Almost surely, 2^1664531464 is an apocalyptic number.

It is an amenable number.

1664531464 is a deficient number, since it is larger than the sum of its proper divisors (1456465046).

1664531464 is a wasteful number, since it uses less digits than its factorization.

1664531464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208066439 (or 208066435 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 1664531464 is about 40798.6698802792. The cubic root of 1664531464 is about 1185.1245725888.

The spelling of 1664531464 in words is "one billion, six hundred sixty-four million, five hundred thirty-one thousand, four hundred sixty-four".