20345522501 has 2 divisors, whose sum is σ = 20345522502. Its totient is φ = 20345522500.

The previous prime is 20345522471. The next prime is 20345522543. The reversal of 20345522501 is 10522554302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17226300001 + 3119222500 = 131249^2 + 55850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345522501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345522201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172761250 + 10172761251.

It is an arithmetic number, because the mean of its divisors is an integer number (10172761251).

Almost surely, 2^20345522501 is an apocalyptic number.

It is an amenable number.

20345522501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345522501 is an equidigital number, since it uses as much as digits as its factorization.

20345522501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 20345522501 in words is "twenty billion, three hundred forty-five million, five hundred twenty-two thousand, five hundred one".