3978960020671 has 2 divisors, whose sum is σ = 3978960020672. Its totient is φ = 3978960020670.

The previous prime is 3978960020639. The next prime is 3978960020689. The reversal of 3978960020671 is 1760200698793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3978960020671 - 2⁵ = 3978960020639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978960020071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989480010335 + 1989480010336.

It is an arithmetic number, because the mean of its divisors is an integer number (1989480010336).

Almost surely, 2^{3978960020671} is an apocalyptic number.

3978960020671 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978960020671 is an equidigital number, since it uses as much as digits as its factorization.

3978960020671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 3978960020671 in words is "three trillion, nine hundred seventy-eight billion, nine hundred sixty million, twenty thousand, six hundred seventy-one".