20898452519957 has 2 divisors, whose sum is σ = 20898452519958. Its totient is φ = 20898452519956.

The previous prime is 20898452519953. The next prime is 20898452520013. The reversal of 20898452519957 is 75991525489802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16645428974161 + 4253023545796 = 4079881^2 + 2062286^2 .

It is a cyclic number.

It is not a de Polignac number, because 20898452519957 - 2² = 20898452519953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20898452519953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10449226259978 + 10449226259979.

It is an arithmetic number, because the mean of its divisors is an integer number (10449226259979).

Almost surely, 2^{20898452519957} is an apocalyptic number.

It is an amenable number.

20898452519957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20898452519957 is an equidigital number, since it uses as much as digits as its factorization.

20898452519957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184000, while the sum is 74.

The spelling of 20898452519957 in words is "twenty trillion, eight hundred ninety-eight billion, four hundred fifty-two million, five hundred nineteen thousand, nine hundred fifty-seven".