20136529997 has 2 divisors, whose sum is σ = 20136529998. Its totient is φ = 20136529996.

The previous prime is 20136529991. The next prime is 20136530059. The reversal of 20136529997 is 79992563102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19995656836 + 140873161 = 141406^2 + 11869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20136529997 - 2⁴ = 20136529981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20136529991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068264998 + 10068264999.

It is an arithmetic number, because the mean of its divisors is an integer number (10068264999).

Almost surely, 2^20136529997 is an apocalyptic number.

It is an amenable number.

20136529997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20136529997 is an equidigital number, since it uses as much as digits as its factorization.

20136529997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 20136529997 in words is "twenty billion, one hundred thirty-six million, five hundred twenty-nine thousand, nine hundred ninety-seven".