3946538778851 has 2 divisors, whose sum is σ = 3946538778852. Its totient is φ = 3946538778850.

The previous prime is 3946538778829. The next prime is 3946538778859. The reversal of 3946538778851 is 1588778356493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3946538778851 is a prime.

It is not a weakly prime, because it can be changed into another prime (3946538778859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973269389425 + 1973269389426.

It is an arithmetic number, because the mean of its divisors is an integer number (1973269389426).

Almost surely, 2^{3946538778851} is an apocalyptic number.

3946538778851 is a deficient number, since it is larger than the sum of its proper divisors (1).

3946538778851 is an equidigital number, since it uses as much as digits as its factorization.

3946538778851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1219276800, while the sum is 74.

The spelling of 3946538778851 in words is "three trillion, nine hundred forty-six billion, five hundred thirty-eight million, seven hundred seventy-eight thousand, eight hundred fifty-one".