526664021 has 16 divisors (see below), whose sum is σ = 608307840. Its totient is φ = 451863360.

The previous prime is 526664009. The next prime is 526664027. The reversal of 526664021 is 120466625.

It is not a de Polignac number, because 526664021 - 2¹⁴ = 526647637 is a prime.

It is a Smith number, since the sum of its digits (32) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (526664027) 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, 7025 + ... + 33206.

It is an arithmetic number, because the mean of its divisors is an integer number (38019240).

Almost surely, 2^526664021 is an apocalyptic number.

It is an amenable number.

526664021 is a deficient number, since it is larger than the sum of its proper divisors (81643819).

526664021 is a wasteful number, since it uses less digits than its factorization.

526664021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40316.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 526664021 is about 22949.1616622481. The cubic root of 526664021 is about 807.5657349510.

The spelling of 526664021 in words is "five hundred twenty-six million, six hundred sixty-four thousand, twenty-one".