82154563081 has 2 divisors, whose sum is σ = 82154563082. Its totient is φ = 82154563080.

The previous prime is 82154563061. The next prime is 82154563091. The reversal of 82154563081 is 18036545128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61722433600 + 20432129481 = 248440^2 + 142941^2 .

It is a cyclic number.

It is not a de Polignac number, because 82154563081 - 2¹⁵ = 82154530313 is a prime.

It is a super-2 number, since 2×82154563081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82154563061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41077281540 + 41077281541.

It is an arithmetic number, because the mean of its divisors is an integer number (41077281541).

Almost surely, 2^82154563081 is an apocalyptic number.

It is an amenable number.

82154563081 is a deficient number, since it is larger than the sum of its proper divisors (1).

82154563081 is an equidigital number, since it uses as much as digits as its factorization.

82154563081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 82154563081 in words is "eighty-two billion, one hundred fifty-four million, five hundred sixty-three thousand, eighty-one".