16505315632997 has 2 divisors, whose sum is σ = 16505315632998. Its totient is φ = 16505315632996.

The previous prime is 16505315632961. The next prime is 16505315633039. The reversal of 16505315632997 is 79923651350561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15981717225796 + 523598407201 = 3997714^2 + 723601^2 .

It is a cyclic number.

It is not a de Polignac number, because 16505315632997 - 2⁶ = 16505315632933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16505315632297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252657816498 + 8252657816499.

It is an arithmetic number, because the mean of its divisors is an integer number (8252657816499).

Almost surely, 2^{16505315632997} is an apocalyptic number.

It is an amenable number.

16505315632997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505315632997 is an equidigital number, since it uses as much as digits as its factorization.

16505315632997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45927000, while the sum is 62.

The spelling of 16505315632997 in words is "sixteen trillion, five hundred five billion, three hundred fifteen million, six hundred thirty-two thousand, nine hundred ninety-seven".