3947789391653 has 2 divisors, whose sum is σ = 3947789391654. Its totient is φ = 3947789391652.

The previous prime is 3947789391649. The next prime is 3947789391659. The reversal of 3947789391653 is 3561939877493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3352202133604 + 595587258049 = 1830902^2 + 771743^2 .

It is a cyclic number.

It is not a de Polignac number, because 3947789391653 - 2² = 3947789391649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3947789391659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973894695826 + 1973894695827.

It is an arithmetic number, because the mean of its divisors is an integer number (1973894695827).

Almost surely, 2^{3947789391653} is an apocalyptic number.

It is an amenable number.

3947789391653 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947789391653 is an equidigital number, since it uses as much as digits as its factorization.

3947789391653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 925888320, while the sum is 74.

The spelling of 3947789391653 in words is "three trillion, nine hundred forty-seven billion, seven hundred eighty-nine million, three hundred ninety-one thousand, six hundred fifty-three".