6658398523 has 4 divisors (see below), whose sum is σ = 7609598320. Its totient is φ = 5707198728.

The previous prime is 6658398493. The next prime is 6658398541. The reversal of 6658398523 is 3258938566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6658398523 - 2¹³ = 6658390331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6658392523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475599888 + ... + 475599901.

It is an arithmetic number, because the mean of its divisors is an integer number (1902399580).

Almost surely, 2^6658398523 is an apocalyptic number.

6658398523 is a deficient number, since it is larger than the sum of its proper divisors (951199797).

6658398523 is an equidigital number, since it uses as much as digits as its factorization.

6658398523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951199796.

The product of its digits is 9331200, while the sum is 55.

The square root of 6658398523 is about 81599.0105515992. The cubic root of 6658398523 is about 1881.2936737756.

The spelling of 6658398523 in words is "six billion, six hundred fifty-eight million, three hundred ninety-eight thousand, five hundred twenty-three".