1640453825 has 12 divisors (see below), whose sum is σ = 2141224560. Its totient is φ = 1243290960.

The previous prime is 1640453819. The next prime is 1640453833. The reversal of 1640453825 is 5283540461.

It is not a de Polignac number, because 1640453825 - 2⁴ = 1640453809 is a prime.

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, 1726319 + ... + 1727268.

It is an arithmetic number, because the mean of its divisors is an integer number (178435380).

Almost surely, 2^1640453825 is an apocalyptic number.

It is an amenable number.

1640453825 is a deficient number, since it is larger than the sum of its proper divisors (500770735).

1640453825 is a wasteful number, since it uses less digits than its factorization.

1640453825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453616 (or 3453611 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 1640453825 is about 40502.5162798560. The cubic root of 1640453825 is about 1179.3824751754.

The spelling of 1640453825 in words is "one billion, six hundred forty million, four hundred fifty-three thousand, eight hundred twenty-five".