640340541499 has 8 divisors (see below), whose sum is σ = 642702071808. Its totient is φ = 637983310440.

The previous prime is 640340541479. The next prime is 640340541521. The reversal of 640340541499 is 994145043046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640340541499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640340541439) 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 7 ways as a sum of consecutive naturals, for example, 776227 + ... + 1372300.

It is an arithmetic number, because the mean of its divisors is an integer number (80337758976).

Almost surely, 2^640340541499 is an apocalyptic number.

640340541499 is a deficient number, since it is larger than the sum of its proper divisors (2361530309).

640340541499 is a wasteful number, since it uses less digits than its factorization.

640340541499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149625.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 640340541499 in words is "six hundred forty billion, three hundred forty million, five hundred forty-one thousand, four hundred ninety-nine".