1640045553 has 16 divisors (see below), whose sum is σ = 2302924800. Its totient is φ = 1035320400.

The previous prime is 1640045513. The next prime is 1640045557. The reversal of 1640045553 is 3555400461.

It is not a de Polignac number, because 1640045553 - 2²⁴ = 1623268337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640045557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139768 + ... + 151046.

It is an arithmetic number, because the mean of its divisors is an integer number (143932800).

Almost surely, 2^1640045553 is an apocalyptic number.

It is an amenable number.

1640045553 is a deficient number, since it is larger than the sum of its proper divisors (662879247).

1640045553 is a wasteful number, since it uses less digits than its factorization.

1640045553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13852.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 1640045553 is about 40497.4758843067. The cubic root of 1640045553 is about 1179.2846264814.

The spelling of 1640045553 in words is "one billion, six hundred forty million, forty-five thousand, five hundred fifty-three".