1664553742 has 32 divisors (see below), whose sum is σ = 2740725504. Its totient is φ = 754790400.

The previous prime is 1664553733. The next prime is 1664553763. The reversal of 1664553742 is 2473554661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250738 + ... + 257290.

It is an arithmetic number, because the mean of its divisors is an integer number (85647672).

Almost surely, 2^1664553742 is an apocalyptic number.

1664553742 is a deficient number, since it is larger than the sum of its proper divisors (1076171762).

1664553742 is a wasteful number, since it uses less digits than its factorization.

1664553742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844.

The product of its digits is 604800, while the sum is 43.

The square root of 1664553742 is about 40798.9429029724. The cubic root of 1664553742 is about 1185.1298597798.

The spelling of 1664553742 in words is "one billion, six hundred sixty-four million, five hundred fifty-three thousand, seven hundred forty-two".