20325491657 has 2 divisors, whose sum is σ = 20325491658. Its totient is φ = 20325491656.

The previous prime is 20325491639. The next prime is 20325491687. The reversal of 20325491657 is 75619452302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19686615481 + 638876176 = 140309^2 + 25276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20325491657 - 2¹⁴ = 20325475273 is a prime.

It is a super-2 number, since 2×20325491657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20325491687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162745828 + 10162745829.

It is an arithmetic number, because the mean of its divisors is an integer number (10162745829).

Almost surely, 2^20325491657 is an apocalyptic number.

It is an amenable number.

20325491657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20325491657 is an equidigital number, since it uses as much as digits as its factorization.

20325491657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 20325491657 in words is "twenty billion, three hundred twenty-five million, four hundred ninety-one thousand, six hundred fifty-seven".