82501608521 has 2 divisors, whose sum is σ = 82501608522. Its totient is φ = 82501608520.

The previous prime is 82501608517. The next prime is 82501608569. The reversal of 82501608521 is 12580610528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60378318400 + 22123290121 = 245720^2 + 148739^2 .

It is a cyclic number.

It is not a de Polignac number, because 82501608521 - 2² = 82501608517 is a prime.

It is not a weakly prime, because it can be changed into another prime (82501608571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41250804260 + 41250804261.

It is an arithmetic number, because the mean of its divisors is an integer number (41250804261).

Almost surely, 2^82501608521 is an apocalyptic number.

It is an amenable number.

82501608521 is a deficient number, since it is larger than the sum of its proper divisors (1).

82501608521 is an equidigital number, since it uses as much as digits as its factorization.

82501608521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 82501608521 in words is "eighty-two billion, five hundred one million, six hundred eight thousand, five hundred twenty-one".