16520211157987 has 2 divisors, whose sum is σ = 16520211157988. Its totient is φ = 16520211157986.

The previous prime is 16520211157969. The next prime is 16520211158063. The reversal of 16520211157987 is 78975111202561.

16520211157987 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 is a cyclic number.

It is not a de Polignac number, because 16520211157987 - 2⁷ = 16520211157859 is a prime.

It is not a weakly prime, because it can be changed into another prime (16520211152987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260105578993 + 8260105578994.

It is an arithmetic number, because the mean of its divisors is an integer number (8260105578994).

Almost surely, 2^{16520211157987} is an apocalyptic number.

16520211157987 is a deficient number, since it is larger than the sum of its proper divisors (1).

16520211157987 is an equidigital number, since it uses as much as digits as its factorization.

16520211157987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2116800, while the sum is 55.

The spelling of 16520211157987 in words is "sixteen trillion, five hundred twenty billion, two hundred eleven million, one hundred fifty-seven thousand, nine hundred eighty-seven".