395513671661 has 2 divisors, whose sum is σ = 395513671662. Its totient is φ = 395513671660.

The previous prime is 395513671591. The next prime is 395513671687. The reversal of 395513671661 is 166176315593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236882730436 + 158630941225 = 486706^2 + 398285^2 .

It is a cyclic number.

It is not a de Polignac number, because 395513671661 - 2¹⁸ = 395513409517 is a prime.

It is a super-3 number, since 3×395513671661³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395513631661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197756835830 + 197756835831.

It is an arithmetic number, because the mean of its divisors is an integer number (197756835831).

Almost surely, 2^395513671661 is an apocalyptic number.

It is an amenable number.

395513671661 is a deficient number, since it is larger than the sum of its proper divisors (1).

395513671661 is an equidigital number, since it uses as much as digits as its factorization.

395513671661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3061800, while the sum is 53.

The spelling of 395513671661 in words is "three hundred ninety-five billion, five hundred thirteen million, six hundred seventy-one thousand, six hundred sixty-one".