83072878981 has 2 divisors, whose sum is σ = 83072878982. Its totient is φ = 83072878980.

The previous prime is 83072878937. The next prime is 83072879009. The reversal of 83072878981 is 18987827038.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74728969956 + 8343909025 = 273366^2 + 91345^2 .

It is a cyclic number.

It is not a de Polignac number, because 83072878981 - 2²⁵ = 83039324549 is a prime.

It is a super-2 number, since 2×83072878981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83072878921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41536439490 + 41536439491.

It is an arithmetic number, because the mean of its divisors is an integer number (41536439491).

Almost surely, 2^83072878981 is an apocalyptic number.

It is an amenable number.

83072878981 is a deficient number, since it is larger than the sum of its proper divisors (1).

83072878981 is an equidigital number, since it uses as much as digits as its factorization.

83072878981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10838016, while the sum is 61.

The spelling of 83072878981 in words is "eighty-three billion, seventy-two million, eight hundred seventy-eight thousand, nine hundred eighty-one".