640140246541415 has 16 divisors (see below), whose sum is σ = 769108887230112. Its totient is φ = 511485205077504.

The previous prime is 640140246541409. The next prime is 640140246541417. The reversal of 640140246541415 is 514145642041046.

It is a cyclic number.

It is not a de Polignac number, because 640140246541415 - 2¹⁶ = 640140246475879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640140246541415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640140246541417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70343192 + ... + 78920498.

It is an arithmetic number, because the mean of its divisors is an integer number (48069305451882).

Almost surely, 2^{640140246541415} is an apocalyptic number.

640140246541415 is a deficient number, since it is larger than the sum of its proper divisors (128968640688697).

640140246541415 is a wasteful number, since it uses less digits than its factorization.

640140246541415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595586.

The product of its (nonzero) digits is 1843200, while the sum is 47.

The spelling of 640140246541415 in words is "six hundred forty trillion, one hundred forty billion, two hundred forty-six million, five hundred forty-one thousand, four hundred fifteen".