1639517145947 has 2 divisors, whose sum is σ = 1639517145948. Its totient is φ = 1639517145946.

The previous prime is 1639517145899. The next prime is 1639517145949. The reversal of 1639517145947 is 7495417159361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1639517145947 - 2¹⁴ = 1639517129563 is a prime.

Together with 1639517145949, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1639517145947.

It is not a weakly prime, because it can be changed into another prime (1639517145949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819758572973 + 819758572974.

It is an arithmetic number, because the mean of its divisors is an integer number (819758572974).

Almost surely, 2^{1639517145947} is an apocalyptic number.

1639517145947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639517145947 is an equidigital number, since it uses as much as digits as its factorization.

1639517145947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28576800, while the sum is 62.

The spelling of 1639517145947 in words is "one trillion, six hundred thirty-nine billion, five hundred seventeen million, one hundred forty-five thousand, nine hundred forty-seven".