1664525 has 12 divisors (see below), whose sum is σ = 2083200. Its totient is φ = 1319280.

The previous prime is 1664501. The next prime is 1664543. The reversal of 1664525 is 5254661.

It is not a de Polignac number, because 1664525 - 2⁶ = 1664461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3236 + ... + 3714.

It is an arithmetic number, because the mean of its divisors is an integer number (173600).

2^1664525 is an apocalyptic number.

It is an amenable number.

1664525 is a deficient number, since it is larger than the sum of its proper divisors (418675).

1664525 is a wasteful number, since it uses less digits than its factorization.

1664525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 623 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 1664525 is about 1290.1647181659. The cubic root of 1664525 is about 118.5123038492.

The spelling of 1664525 in words is "one million, six hundred sixty-four thousand, five hundred twenty-five".