1640500001 has 16 divisors (see below), whose sum is σ = 1958805504. Its totient is φ = 1343333904.

The previous prime is 1640499989. The next prime is 1640500003. The reversal of 1640500001 is 1000050461.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1640500001 - 2¹⁸ = 1640237857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640500003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133040 + ... + 144846.

It is an arithmetic number, because the mean of its divisors is an integer number (122425344).

Almost surely, 2^1640500001 is an apocalyptic number.

It is an amenable number.

1640500001 is a deficient number, since it is larger than the sum of its proper divisors (318305503).

1640500001 is a wasteful number, since it uses less digits than its factorization.

1640500001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12700.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1640500001 is about 40503.0863145020. The cubic root of 1640500001 is about 1179.3935409454.

Adding to 1640500001 its reverse (1000050461), we get a palindrome (2640550462).

The spelling of 1640500001 in words is "one billion, six hundred forty million, five hundred thousand, one".