135651260821 has 8 divisors (see below), whose sum is σ = 137882142488. Its totient is φ = 133420608000.

The previous prime is 135651260819. The next prime is 135651260939. The reversal of 135651260821 is 128062156531.

It can be written as a sum of positive squares in 4 ways, for example, as 22997722500 + 112653538321 = 151650^2 + 335639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135651260821 - 2¹ = 135651260819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135651261821) 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 7 ways as a sum of consecutive naturals, for example, 1470541 + ... + 1560061.

It is an arithmetic number, because the mean of its divisors is an integer number (17235267811).

Almost surely, 2^135651260821 is an apocalyptic number.

It is an amenable number.

135651260821 is a deficient number, since it is larger than the sum of its proper divisors (2230881667).

135651260821 is an equidigital number, since it uses as much as digits as its factorization.

135651260821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114423.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 135651260821 in words is "one hundred thirty-five billion, six hundred fifty-one million, two hundred sixty thousand, eight hundred twenty-one".