1640504995683 has 8 divisors (see below), whose sum is σ = 2187346825296. Its totient is φ = 1093666581600.

The previous prime is 1640504995673. The next prime is 1640504995693. The reversal of 1640504995683 is 3865994050461.

It is a Cunningham number, because it is equal to 1280822²-1.

It is an interprime number because it is at equal distance from previous prime (1640504995673) and next prime (1640504995693).

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

It is a de Polignac number, because none of the positive numbers 2^k-1640504995683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640504995673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640413 + ... + 1921233.

It is an arithmetic number, because the mean of its divisors is an integer number (273418353162).

Almost surely, 2^{1640504995683} is an apocalyptic number.

1640504995683 is a deficient number, since it is larger than the sum of its proper divisors (546841829613).

1640504995683 is a wasteful number, since it uses less digits than its factorization.

1640504995683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707765.

The product of its (nonzero) digits is 27993600, while the sum is 60.

The spelling of 1640504995683 in words is "one trillion, six hundred forty billion, five hundred four million, nine hundred ninety-five thousand, six hundred eighty-three".