20125223513 has 2 divisors, whose sum is σ = 20125223514. Its totient is φ = 20125223512.

The previous prime is 20125223501. The next prime is 20125223549. The reversal of 20125223513 is 31532252102.

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., 14919889609 + 5205333904 = 122147^2 + 72148^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125223513 - 2⁸ = 20125223257 is a prime.

It is a super-2 number, since 2×20125223513² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20125223593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062611756 + 10062611757.

It is an arithmetic number, because the mean of its divisors is an integer number (10062611757).

Almost surely, 2^20125223513 is an apocalyptic number.

It is an amenable number.

20125223513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125223513 is an equidigital number, since it uses as much as digits as its factorization.

20125223513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20125223513 its reverse (31532252102), we get a palindrome (51657475615).

The spelling of 20125223513 in words is "twenty billion, one hundred twenty-five million, two hundred twenty-three thousand, five hundred thirteen".