1645246525 has 12 divisors (see below), whose sum is σ = 2197037332. Its totient is φ = 1214951040.

The previous prime is 1645246513. The next prime is 1645246541. The reversal of 1645246525 is 5256425461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 524135236 + 1121111289 = 22894^2 + 33483^2 .

It is not a de Polignac number, because 1645246525 - 2⁹ = 1645246013 is a prime.

It is a super-2 number, since 2×1645246525² = 5413672256049151250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2530824 + ... + 2531473.

Almost surely, 2^1645246525 is an apocalyptic number.

It is an amenable number.

1645246525 is a deficient number, since it is larger than the sum of its proper divisors (551790807).

1645246525 is a wasteful number, since it uses less digits than its factorization.

1645246525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062320 (or 5062315 counting only the distinct ones).

The product of its digits is 288000, while the sum is 40.

The square root of 1645246525 is about 40561.6385886961. The cubic root of 1645246525 is about 1180.5299077878.

The spelling of 1645246525 in words is "one billion, six hundred forty-five million, two hundred forty-six thousand, five hundred twenty-five".