1640514745 has 4 divisors (see below), whose sum is σ = 1968617700. Its totient is φ = 1312411792.

The previous prime is 1640514727. The next prime is 1640514749. The reversal of 1640514745 is 5474150461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567821241 + 1072693504 = 23829^2 + 32752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640514745 - 2⁵ = 1640514713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640514749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164051470 + ... + 164051479.

It is an arithmetic number, because the mean of its divisors is an integer number (492154425).

Almost surely, 2^1640514745 is an apocalyptic number.

It is an amenable number.

1640514745 is a deficient number, since it is larger than the sum of its proper divisors (328102955).

1640514745 is an equidigital number, since it uses as much as digits as its factorization.

1640514745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328102954.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 1640514745 is about 40503.2683249142. The cubic root of 1640514745 is about 1179.3970742028.

The spelling of 1640514745 in words is "one billion, six hundred forty million, five hundred fourteen thousand, seven hundred forty-five".