1640120065 has 8 divisors (see below), whose sum is σ = 1968364800. Its totient is φ = 1311948912.

The previous prime is 1640120063. The next prime is 1640120107. The reversal of 1640120065 is 5600210461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640120065 - 2¹ = 1640120063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640120063) 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 7 ways as a sum of consecutive naturals, for example, 65136 + ... + 86734.

It is an arithmetic number, because the mean of its divisors is an integer number (246045600).

Almost surely, 2^1640120065 is an apocalyptic number.

It is an amenable number.

1640120065 is a deficient number, since it is larger than the sum of its proper divisors (328244735).

1640120065 is a wasteful number, since it uses less digits than its factorization.

1640120065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36791.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1640120065 is about 40498.3958324277. The cubic root of 1640120065 is about 1179.3024856450.

The spelling of 1640120065 in words is "one billion, six hundred forty million, one hundred twenty thousand, sixty-five".