15323068661 has 4 divisors (see below), whose sum is σ = 15324478092. Its totient is φ = 15321659232.

The previous prime is 15323068603. The next prime is 15323068693. The reversal of 15323068661 is 16686032351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16686032351 = 19 ⋅878212229.

It can be written as a sum of positive squares in 2 ways, for example, as 4482302500 + 10840766161 = 66950^2 + 104119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15323068661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15323068261) 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, 688280 + ... + 710193.

It is an arithmetic number, because the mean of its divisors is an integer number (3831119523).

Almost surely, 2^15323068661 is an apocalyptic number.

It is an amenable number.

15323068661 is a deficient number, since it is larger than the sum of its proper divisors (1409431).

15323068661 is a wasteful number, since it uses less digits than its factorization.

15323068661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409430.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 15323068661 in words is "fifteen billion, three hundred twenty-three million, sixty-eight thousand, six hundred sixty-one".