1640244545 has 16 divisors (see below), whose sum is σ = 2021509440. Its totient is φ = 1277160000.

The previous prime is 1640244539. The next prime is 1640244547. The reversal of 1640244545 is 5454420461.

It is not a de Polignac number, because 1640244545 - 2⁶ = 1640244481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640244547) 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, 2270 + ... + 57320.

It is an arithmetic number, because the mean of its divisors is an integer number (126344340).

Almost surely, 2^1640244545 is an apocalyptic number.

It is an amenable number.

1640244545 is a deficient number, since it is larger than the sum of its proper divisors (381264895).

1640244545 is a wasteful number, since it uses less digits than its factorization.

1640244545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55216.

The product of its (nonzero) digits is 76800, while the sum is 35.

The square root of 1640244545 is about 40499.9326542650. The cubic root of 1640244545 is about 1179.3323200177.

The spelling of 1640244545 in words is "one billion, six hundred forty million, two hundred forty-four thousand, five hundred forty-five".