899415068521 has 2 divisors, whose sum is σ = 899415068522. Its totient is φ = 899415068520.

The previous prime is 899415068479. The next prime is 899415068569. The reversal of 899415068521 is 125860514998.

899415068521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876163393296 + 23251675225 = 936036^2 + 152485^2 .

It is a cyclic number.

It is not a de Polignac number, because 899415068521 - 2²⁵ = 899381514089 is a prime.

It is not a weakly prime, because it can be changed into another prime (899415068621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449707534260 + 449707534261.

It is an arithmetic number, because the mean of its divisors is an integer number (449707534261).

Almost surely, 2^899415068521 is an apocalyptic number.

It is an amenable number.

899415068521 is a deficient number, since it is larger than the sum of its proper divisors (1).

899415068521 is an equidigital number, since it uses as much as digits as its factorization.

899415068521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 899415068521 in words is "eight hundred ninety-nine billion, four hundred fifteen million, sixty-eight thousand, five hundred twenty-one".