23578157321 has 2 divisors, whose sum is σ = 23578157322. Its totient is φ = 23578157320.

The previous prime is 23578157311. The next prime is 23578157353. The reversal of 23578157321 is 12375187532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19486764025 + 4091393296 = 139595^2 + 63964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23578157321 is a prime.

It is not a weakly prime, because it can be changed into another prime (23578157311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11789078660 + 11789078661.

It is an arithmetic number, because the mean of its divisors is an integer number (11789078661).

Almost surely, 2^23578157321 is an apocalyptic number.

It is an amenable number.

23578157321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23578157321 is an equidigital number, since it uses as much as digits as its factorization.

23578157321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 44.

The spelling of 23578157321 in words is "twenty-three billion, five hundred seventy-eight million, one hundred fifty-seven thousand, three hundred twenty-one".