3945747966397 has 2 divisors, whose sum is σ = 3945747966398. Its totient is φ = 3945747966396.

The previous prime is 3945747966337. The next prime is 3945747966463. The reversal of 3945747966397 is 7936697475493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3720909829156 + 224838137241 = 1928966^2 + 474171^2 .

It is an emirp because it is prime and its reverse (7936697475493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3945747966397 - 2¹⁵ = 3945747933629 is a prime.

It is a super-2 number, since 2×3945747966397² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945747966337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972873983198 + 1972873983199.

It is an arithmetic number, because the mean of its divisors is an integer number (1972873983199).

Almost surely, 2^{3945747966397} is an apocalyptic number.

It is an amenable number.

3945747966397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945747966397 is an equidigital number, since it uses as much as digits as its factorization.

3945747966397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6481218240, while the sum is 79.

The spelling of 3945747966397 in words is "three trillion, nine hundred forty-five billion, seven hundred forty-seven million, nine hundred sixty-six thousand, three hundred ninety-seven".