83404073681 has 2 divisors, whose sum is σ = 83404073682. Its totient is φ = 83404073680.

The previous prime is 83404073671. The next prime is 83404073723. The reversal of 83404073681 is 18637040438.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54176752081 + 29227321600 = 232759^2 + 170960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83404073681 is a prime.

It is a super-2 number, since 2×83404073681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (83404073671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41702036840 + 41702036841.

It is an arithmetic number, because the mean of its divisors is an integer number (41702036841).

Almost surely, 2^83404073681 is an apocalyptic number.

It is an amenable number.

83404073681 is a deficient number, since it is larger than the sum of its proper divisors (1).

83404073681 is an equidigital number, since it uses as much as digits as its factorization.

83404073681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 83404073681 in words is "eighty-three billion, four hundred four million, seventy-three thousand, six hundred eighty-one".