20146113557 has 2 divisors, whose sum is σ = 20146113558. Its totient is φ = 20146113556.

The previous prime is 20146113553. The next prime is 20146113569. The reversal of 20146113557 is 75531164102.

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., 19298488561 + 847624996 = 138919^2 + 29114^2 .

It is a cyclic number.

It is not a de Polignac number, because 20146113557 - 2² = 20146113553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20146113553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10073056778 + 10073056779.

It is an arithmetic number, because the mean of its divisors is an integer number (10073056779).

Almost surely, 2^20146113557 is an apocalyptic number.

It is an amenable number.

20146113557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20146113557 is an equidigital number, since it uses as much as digits as its factorization.

20146113557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

Adding to 20146113557 its reverse (75531164102), we get a palindrome (95677277659).

The spelling of 20146113557 in words is "twenty billion, one hundred forty-six million, one hundred thirteen thousand, five hundred fifty-seven".