20553523157 has 2 divisors, whose sum is σ = 20553523158. Its totient is φ = 20553523156.

The previous prime is 20553523153. The next prime is 20553523213. The reversal of 20553523157 is 75132535502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14367857956 + 6185665201 = 119866^2 + 78649^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553523157 - 2² = 20553523153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20553523157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20553523153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276761578 + 10276761579.

It is an arithmetic number, because the mean of its divisors is an integer number (10276761579).

Almost surely, 2^20553523157 is an apocalyptic number.

It is an amenable number.

20553523157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553523157 is an equidigital number, since it uses as much as digits as its factorization.

20553523157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 38.

The spelling of 20553523157 in words is "twenty billion, five hundred fifty-three million, five hundred twenty-three thousand, one hundred fifty-seven".