381258717722461 has 2 divisors, whose sum is σ = 381258717722462. Its totient is φ = 381258717722460.

The previous prime is 381258717722419. The next prime is 381258717722483. The reversal of 381258717722461 is 164227717852183.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316848366055225 + 64410351667236 = 17800235^2 + 8025606^2 .

It is a cyclic number.

It is not a de Polignac number, because 381258717722461 - 2²⁵ = 381258684168029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381258717722393 and 381258717722402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381258717722161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190629358861230 + 190629358861231.

It is an arithmetic number, because the mean of its divisors is an integer number (190629358861231).

Almost surely, 2^{381258717722461} is an apocalyptic number.

It is an amenable number.

381258717722461 is a deficient number, since it is larger than the sum of its proper divisors (1).

381258717722461 is an equidigital number, since it uses as much as digits as its factorization.

381258717722461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63221760, while the sum is 64.

The spelling of 381258717722461 in words is "three hundred eighty-one trillion, two hundred fifty-eight billion, seven hundred seventeen million, seven hundred twenty-two thousand, four hundred sixty-one".