664087533 has 16 divisors (see below), whose sum is σ = 928112640. Its totient is φ = 421567344.

The previous prime is 664087519. The next prime is 664087547. The reversal of 664087533 is 335780466.

It is an interprime number because it is at equal distance from previous prime (664087519) and next prime (664087547).

It is not a de Polignac number, because 664087533 - 2⁶ = 664087469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664083533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6193 + ... + 36966.

It is an arithmetic number, because the mean of its divisors is an integer number (58007040).

Almost surely, 2^664087533 is an apocalyptic number.

It is an amenable number.

664087533 is a deficient number, since it is larger than the sum of its proper divisors (264025107).

664087533 is a wasteful number, since it uses less digits than its factorization.

664087533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43408.

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 664087533 is about 25769.8958670772. The cubic root of 664087533 is about 872.4524684632.

The spelling of 664087533 in words is "six hundred sixty-four million, eighty-seven thousand, five hundred thirty-three".