4251661523 has 2 divisors, whose sum is σ = 4251661524. Its totient is φ = 4251661522.

The previous prime is 4251661487. The next prime is 4251661567. The reversal of 4251661523 is 3251661524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4251661523 - 2¹⁶ = 4251595987 is a prime.

It is not a weakly prime, because it can be changed into another prime (4251669523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2125830761 + 2125830762.

It is an arithmetic number, because the mean of its divisors is an integer number (2125830762).

Almost surely, 2^4251661523 is an apocalyptic number.

4251661523 is a deficient number, since it is larger than the sum of its proper divisors (1).

4251661523 is an equidigital number, since it uses as much as digits as its factorization.

4251661523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 4251661523 is about 65204.7661064741. The cubic root of 4251661523 is about 1620.0169590004.

Subtracting from 4251661523 its reverse (3251661524), we obtain a palindrome (999999999).

The spelling of 4251661523 in words is "four billion, two hundred fifty-one million, six hundred sixty-one thousand, five hundred twenty-three".