1640542105 has 16 divisors (see below), whose sum is σ = 1993305600. Its totient is φ = 1296077760.

The previous prime is 1640542087. The next prime is 1640542133. The reversal of 1640542105 is 5012450461.

It is a de Polignac number, because none of the positive numbers 2^k-1640542105 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164656 + ... + 174334.

It is an arithmetic number, because the mean of its divisors is an integer number (124581600).

Almost surely, 2^1640542105 is an apocalyptic number.

It is an amenable number.

1640542105 is a deficient number, since it is larger than the sum of its proper divisors (352763495).

1640542105 is a wasteful number, since it uses less digits than its factorization.

1640542105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10104.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1640542105 is about 40503.6060740275. The cubic root of 1640542105 is about 1179.4036307069.

Adding to 1640542105 its reverse (5012450461), we get a palindrome (6652992566).

The spelling of 1640542105 in words is "one billion, six hundred forty million, five hundred forty-two thousand, one hundred five".