1640168533 has 8 divisors (see below), whose sum is σ = 1664748800. Its totient is φ = 1615683888.

The previous prime is 1640168531. The next prime is 1640168557. The reversal of 1640168533 is 3358610461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640168533 - 2¹ = 1640168531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640168492 and 1640168501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640168531) 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, 11035 + ... + 58327.

It is an arithmetic number, because the mean of its divisors is an integer number (208093600).

Almost surely, 2^1640168533 is an apocalyptic number.

It is an amenable number.

1640168533 is a deficient number, since it is larger than the sum of its proper divisors (24580267).

1640168533 is an equidigital number, since it uses as much as digits as its factorization.

1640168533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47811.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1640168533 is about 40498.9942220791. The cubic root of 1640168533 is about 1179.3141022478.

Adding to 1640168533 its reverse (3358610461), we get a palindrome (4998778994).

The spelling of 1640168533 in words is "one billion, six hundred forty million, one hundred sixty-eight thousand, five hundred thirty-three".