136623109621 has 2 divisors, whose sum is σ = 136623109622. Its totient is φ = 136623109620.

The previous prime is 136623109603. The next prime is 136623109661. The reversal of 136623109621 is 126901326631.

It is an a-pointer prime, because the next prime (136623109661) can be obtained adding 136623109621 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131269260721 + 5353848900 = 362311^2 + 73170^2 .

It is a cyclic number.

It is not a de Polignac number, because 136623109621 - 2¹¹ = 136623107573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136623109661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68311554810 + 68311554811.

It is an arithmetic number, because the mean of its divisors is an integer number (68311554811).

Almost surely, 2^136623109621 is an apocalyptic number.

It is an amenable number.

136623109621 is a deficient number, since it is larger than the sum of its proper divisors (1).

136623109621 is an equidigital number, since it uses as much as digits as its factorization.

136623109621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 136623109621 in words is "one hundred thirty-six billion, six hundred twenty-three million, one hundred nine thousand, six hundred twenty-one".