639741013633 has 4 divisors (see below), whose sum is σ = 640553900080. Its totient is φ = 638928127188.

The previous prime is 639741013619. The next prime is 639741013687. The reversal of 639741013633 is 336310147936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639741013633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639741013603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406442043 + ... + 406443616.

It is an arithmetic number, because the mean of its divisors is an integer number (160138475020).

Almost surely, 2^639741013633 is an apocalyptic number.

It is an amenable number.

639741013633 is a deficient number, since it is larger than the sum of its proper divisors (812886447).

639741013633 is an equidigital number, since it uses as much as digits as its factorization.

639741013633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812886446.

The product of its (nonzero) digits is 734832, while the sum is 46.

The spelling of 639741013633 in words is "six hundred thirty-nine billion, seven hundred forty-one million, thirteen thousand, six hundred thirty-three".