83654171681 has 2 divisors, whose sum is σ = 83654171682. Its totient is φ = 83654171680.

The previous prime is 83654171621. The next prime is 83654171753. The reversal of 83654171681 is 18617145638.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68329960000 + 15324211681 = 261400^2 + 123791^2 .

It is a cyclic number.

It is not a de Polignac number, because 83654171681 - 2⁶ = 83654171617 is a prime.

It is a super-2 number, since 2×83654171681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83654171611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41827085840 + 41827085841.

It is an arithmetic number, because the mean of its divisors is an integer number (41827085841).

Almost surely, 2^83654171681 is an apocalyptic number.

It is an amenable number.

83654171681 is a deficient number, since it is larger than the sum of its proper divisors (1).

83654171681 is an equidigital number, since it uses as much as digits as its factorization.

83654171681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The spelling of 83654171681 in words is "eighty-three billion, six hundred fifty-four million, one hundred seventy-one thousand, six hundred eighty-one".