1640218479485 has 8 divisors (see below), whose sum is σ = 1968282155616. Its totient is φ = 1312161463440.

The previous prime is 1640218479481. The next prime is 1640218479509. The reversal of 1640218479485 is 5849748120461.

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

It is not a de Polignac number, because 1640218479485 - 2² = 1640218479481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640218479481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1106159 + ... + 2122268.

It is an arithmetic number, because the mean of its divisors is an integer number (246035269452).

Almost surely, 2^{1640218479485} is an apocalyptic number.

It is an amenable number.

1640218479485 is a deficient number, since it is larger than the sum of its proper divisors (328063676131).

1640218479485 is a wasteful number, since it uses less digits than its factorization.

1640218479485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330043.

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 1640218479485 in words is "one trillion, six hundred forty billion, two hundred eighteen million, four hundred seventy-nine thousand, four hundred eighty-five".