3875505578221 has 2 divisors, whose sum is σ = 3875505578222. Its totient is φ = 3875505578220.

The previous prime is 3875505578209. The next prime is 3875505578317. The reversal of 3875505578221 is 1228755055783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3808297608196 + 67207970025 = 1951486^2 + 259245^2 .

It is a cyclic number.

It is not a de Polignac number, because 3875505578221 - 2⁹ = 3875505577709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3875505578821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1937752789110 + 1937752789111.

It is an arithmetic number, because the mean of its divisors is an integer number (1937752789111).

Almost surely, 2^{3875505578221} is an apocalyptic number.

It is an amenable number.

3875505578221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3875505578221 is an equidigital number, since it uses as much as digits as its factorization.

3875505578221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520000, while the sum is 58.

The spelling of 3875505578221 in words is "three trillion, eight hundred seventy-five billion, five hundred five million, five hundred seventy-eight thousand, two hundred twenty-one".