3877742322581 has 2 divisors, whose sum is σ = 3877742322582. Its totient is φ = 3877742322580.

The previous prime is 3877742322569. The next prime is 3877742322583. The reversal of 3877742322581 is 1852232477783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2838635280625 + 1039107041956 = 1684825^2 + 1019366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3877742322581 is a prime.

It is a super-2 number, since 2×3877742322581² (a number of 26 digits) contains 22 as substring.

Together with 3877742322583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3877742322581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3877742322583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1938871161290 + 1938871161291.

It is an arithmetic number, because the mean of its divisors is an integer number (1938871161291).

Almost surely, 2^{3877742322581} is an apocalyptic number.

It is an amenable number.

3877742322581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3877742322581 is an equidigital number, since it uses as much as digits as its factorization.

3877742322581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31610880, while the sum is 59.

The spelling of 3877742322581 in words is "three trillion, eight hundred seventy-seven billion, seven hundred forty-two million, three hundred twenty-two thousand, five hundred eighty-one".