16506146501 has 4 divisors (see below), whose sum is σ = 17775850092.
Its totient is φ = 15236442912.
The previous prime is 16506146497. The next prime is 16506146519. The reversal of 16506146501 is 10564160561.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 1449629476 + 15056517025 = 38074^2 + 122705^2
It is a cyclic number.
It is not a de Polignac number, because 16506146501 - 22 = 16506146497 is a prime.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (16506146521) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634851776 + ... + 634851801.
It is an arithmetic number, because the mean of its divisors is an integer number (4443962523).
Almost surely, 216506146501 is an apocalyptic number.
It is an amenable number.
16506146501 is a deficient number, since it is larger than the sum of its proper divisors (1269703591).
16506146501 is a wasteful number, since it uses less digits than its factorization.
16506146501 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1269703590.
The product of its (nonzero) digits is 21600, while the sum is 35.
The spelling of 16506146501 in words is "sixteen billion, five hundred six million, one hundred forty-six thousand, five hundred one".