1640142445 has 16 divisors (see below), whose sum is σ = 1991118528. Its totient is φ = 1296852480.

The previous prime is 1640142391. The next prime is 1640142479. The reversal of 1640142445 is 5442410461.

It is not a de Polignac number, because 1640142445 - 2¹⁹ = 1639618157 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 457510 + ... + 461080.

It is an arithmetic number, because the mean of its divisors is an integer number (124444908).

Almost surely, 2^1640142445 is an apocalyptic number.

It is an amenable number.

1640142445 is a deficient number, since it is larger than the sum of its proper divisors (350976083).

1640142445 is an equidigital number, since it uses as much as digits as its factorization.

1640142445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4620.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1640142445 is about 40498.6721387257. The cubic root of 1640142445 is about 1179.3078496161.

The spelling of 1640142445 in words is "one billion, six hundred forty million, one hundred forty-two thousand, four hundred forty-five".