1664553743 has 4 divisors (see below), whose sum is σ = 1709541720. Its totient is φ = 1619565768.

The previous prime is 1664553733. The next prime is 1664553763. The reversal of 1664553743 is 3473554661.

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

It is a cyclic number.

It is not a de Polignac number, because 1664553743 - 2¹² = 1664549647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664553694 and 1664553703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664553703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22493933 + ... + 22494006.

It is an arithmetic number, because the mean of its divisors is an integer number (427385430).

Almost surely, 2^1664553743 is an apocalyptic number.

1664553743 is a deficient number, since it is larger than the sum of its proper divisors (44987977).

1664553743 is an equidigital number, since it uses as much as digits as its factorization.

1664553743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44987976.

The product of its digits is 907200, while the sum is 44.

The square root of 1664553743 is about 40798.9429152276. The cubic root of 1664553743 is about 1185.1298600171.

The spelling of 1664553743 in words is "one billion, six hundred sixty-four million, five hundred fifty-three thousand, seven hundred forty-three".