664155553 has 4 divisors (see below), whose sum is σ = 664338708. Its totient is φ = 663972400.

The previous prime is 664155551. The next prime is 664155559. The reversal of 664155553 is 355551466.

664155553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 494973504 + 169182049 = 22248^2 + 13007^2 .

It is a cyclic number.

It is not a de Polignac number, because 664155553 - 2¹ = 664155551 is a prime.

It is a super-2 number, since 2×664155553² = 882205197161471618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664155551) 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, 86026 + ... + 93427.

It is an arithmetic number, because the mean of its divisors is an integer number (166084677).

Almost surely, 2^664155553 is an apocalyptic number.

It is an amenable number.

664155553 is a deficient number, since it is larger than the sum of its proper divisors (183155).

664155553 is a wasteful number, since it uses less digits than its factorization.

664155553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183154.

The product of its digits is 270000, while the sum is 40.

The square root of 664155553 is about 25771.2155902666. The cubic root of 664155553 is about 872.4822547930.

The spelling of 664155553 in words is "six hundred sixty-four million, one hundred fifty-five thousand, five hundred fifty-three".