1640432601 has 8 divisors (see below), whose sum is σ = 2430270560. Its totient is φ = 1093621716.

The previous prime is 1640432579. The next prime is 1640432617. The reversal of 1640432601 is 1062340461.

1640432601 is a `hidden beast` number, since 16 + 4 + 0 + 43 + 2 + 601 = 666.

It is not a de Polignac number, because 1640432601 - 2¹⁹ = 1639908313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 60756763 = 1640432601 / (1 + 6 + 4 + 0 + 4 + 3 + 2 + 6 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640431601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30378355 + ... + 30378408.

It is an arithmetic number, because the mean of its divisors is an integer number (303783820).

Almost surely, 2^1640432601 is an apocalyptic number.

It is an amenable number.

1640432601 is a deficient number, since it is larger than the sum of its proper divisors (789837959).

1640432601 is an equidigital number, since it uses as much as digits as its factorization.

1640432601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60756772 (or 60756766 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1640432601 is about 40502.2542705959. The cubic root of 1640432601 is about 1179.3773889159.

The spelling of 1640432601 in words is "one billion, six hundred forty million, four hundred thirty-two thousand, six hundred one".