16636426501 has 2 divisors, whose sum is σ = 16636426502. Its totient is φ = 16636426500.

The previous prime is 16636426451. The next prime is 16636426517. The reversal of 16636426501 is 10562463661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15768829476 + 867597025 = 125574^2 + 29455^2 .

It is an emirp because it is prime and its reverse (10562463661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16636426501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16636426561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8318213250 + 8318213251.

It is an arithmetic number, because the mean of its divisors is an integer number (8318213251).

Almost surely, 2^16636426501 is an apocalyptic number.

It is an amenable number.

16636426501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16636426501 is an equidigital number, since it uses as much as digits as its factorization.

16636426501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 16636426501 in words is "sixteen billion, six hundred thirty-six million, four hundred twenty-six thousand, five hundred one".