20345532553 has 2 divisors, whose sum is σ = 20345532554. Its totient is φ = 20345532552.

The previous prime is 20345532511. The next prime is 20345532563. The reversal of 20345532553 is 35523554302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19451044089 + 894488464 = 139467^2 + 29908^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345532553 - 2¹⁷ = 20345401481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20345532563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172766276 + 10172766277.

It is an arithmetic number, because the mean of its divisors is an integer number (10172766277).

Almost surely, 2^20345532553 is an apocalyptic number.

It is an amenable number.

20345532553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345532553 is an equidigital number, since it uses as much as digits as its factorization.

20345532553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 37.

The spelling of 20345532553 in words is "twenty billion, three hundred forty-five million, five hundred thirty-two thousand, five hundred fifty-three".