168410025521 has 2 divisors, whose sum is σ = 168410025522. Its totient is φ = 168410025520.

The previous prime is 168410025493. The next prime is 168410025593. The reversal of 168410025521 is 125520014861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148041027121 + 20368998400 = 384761^2 + 142720^2 .

It is a cyclic number.

It is not a de Polignac number, because 168410025521 - 2¹⁴ = 168410009137 is a prime.

It is not a weakly prime, because it can be changed into another prime (168410075521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84205012760 + 84205012761.

It is an arithmetic number, because the mean of its divisors is an integer number (84205012761).

Almost surely, 2^168410025521 is an apocalyptic number.

It is an amenable number.

168410025521 is a deficient number, since it is larger than the sum of its proper divisors (1).

168410025521 is an equidigital number, since it uses as much as digits as its factorization.

168410025521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 35.

The spelling of 168410025521 in words is "one hundred sixty-eight billion, four hundred ten million, twenty-five thousand, five hundred twenty-one".