1639847980717 has 4 divisors (see below), whose sum is σ = 1640300605920. Its totient is φ = 1639395355516.

The previous prime is 1639847980681. The next prime is 1639847980753. The reversal of 1639847980717 is 7170897489361.

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 an interprime number because it is at equal distance from previous prime (1639847980681) and next prime (1639847980753).

It is a cyclic number.

It is not a de Polignac number, because 1639847980717 - 2²⁷ = 1639713762989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639847980787) 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, 226307167 + ... + 226314412.

It is an arithmetic number, because the mean of its divisors is an integer number (410075151480).

Almost surely, 2^{1639847980717} is an apocalyptic number.

It is an amenable number.

1639847980717 is a deficient number, since it is larger than the sum of its proper divisors (452625203).

1639847980717 is an equidigital number, since it uses as much as digits as its factorization.

1639847980717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452625202.

The product of its (nonzero) digits is 128024064, while the sum is 70.

The spelling of 1639847980717 in words is "one trillion, six hundred thirty-nine billion, eight hundred forty-seven million, nine hundred eighty thousand, seven hundred seventeen".