1864461771661 has 2 divisors, whose sum is σ = 1864461771662. Its totient is φ = 1864461771660.

The previous prime is 1864461771631. The next prime is 1864461771701. The reversal of 1864461771661 is 1661771644681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021526618436 + 842935153225 = 1010706^2 + 918115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864461771661 - 2⁹ = 1864461771149 is a prime.

It is a super-3 number, since 3×1864461771661³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1864461771596 and 1864461771605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1864461771631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932230885830 + 932230885831.

It is an arithmetic number, because the mean of its divisors is an integer number (932230885831).

Almost surely, 2^{1864461771661} is an apocalyptic number.

It is an amenable number.

1864461771661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864461771661 is an equidigital number, since it uses as much as digits as its factorization.

1864461771661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 58.

The spelling of 1864461771661 in words is "one trillion, eight hundred sixty-four billion, four hundred sixty-one million, seven hundred seventy-one thousand, six hundred sixty-one".