639916109507603 has 2 divisors, whose sum is σ = 639916109507604. Its totient is φ = 639916109507602.

The previous prime is 639916109507569. The next prime is 639916109507677. The reversal of 639916109507603 is 306705901619936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639916109507603 - 2¹⁰ = 639916109506579 is a prime.

It is a super-2 number, since 2×639916109507603² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639916109507603.

It is not a weakly prime, because it can be changed into another prime (639916106507603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319958054753801 + 319958054753802.

It is an arithmetic number, because the mean of its divisors is an integer number (319958054753802).

Almost surely, 2^{639916109507603} is an apocalyptic number.

639916109507603 is a deficient number, since it is larger than the sum of its proper divisors (1).

639916109507603 is an equidigital number, since it uses as much as digits as its factorization.

639916109507603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49601160, while the sum is 65.

The spelling of 639916109507603 in words is "six hundred thirty-nine trillion, nine hundred sixteen billion, one hundred nine million, five hundred seven thousand, six hundred three".