664187529 has 4 divisors (see below), whose sum is σ = 885583376. Its totient is φ = 442791684.

The previous prime is 664187519. The next prime is 664187591. The reversal of 664187529 is 925781466.

664187529 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 664187529 - 2¹³ = 664179337 is a prime.

It is a super-2 number, since 2×664187529² = 882290147358251682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664187519) 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, 110697919 + ... + 110697924.

It is an arithmetic number, because the mean of its divisors is an integer number (221395844).

Almost surely, 2^664187529 is an apocalyptic number.

It is an amenable number.

664187529 is a deficient number, since it is larger than the sum of its proper divisors (221395847).

664187529 is a wasteful number, since it uses less digits than its factorization.

664187529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221395846.

The product of its digits is 725760, while the sum is 48.

The square root of 664187529 is about 25771.8359648668. The cubic root of 664187529 is about 872.4962565555.

The spelling of 664187529 in words is "six hundred sixty-four million, one hundred eighty-seven thousand, five hundred twenty-nine".