1631717645377 has 2 divisors, whose sum is σ = 1631717645378. Its totient is φ = 1631717645376.

The previous prime is 1631717645347. The next prime is 1631717645429. The reversal of 1631717645377 is 7735467171361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1602049649841 + 29667995536 = 1265721^2 + 172244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631717645377 - 2¹¹ = 1631717643329 is a prime.

It is a super-3 number, since 3×1631717645377³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1631717645347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815858822688 + 815858822689.

It is an arithmetic number, because the mean of its divisors is an integer number (815858822689).

Almost surely, 2^{1631717645377} is an apocalyptic number.

It is an amenable number.

1631717645377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631717645377 is an equidigital number, since it uses as much as digits as its factorization.

1631717645377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15558480, while the sum is 58.

The spelling of 1631717645377 in words is "one trillion, six hundred thirty-one billion, seven hundred seventeen million, six hundred forty-five thousand, three hundred seventy-seven".