15315633661 has 8 divisors (see below), whose sum is σ = 15677783264. Its totient is φ = 14953755600.

The previous prime is 15315633647. The next prime is 15315633667. The reversal of 15315633661 is 16633651351.

It is a happy number.

15315633661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15315633661 - 2¹¹ = 15315631613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15315633667) 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 in 7 ways as a sum of consecutive naturals, for example, 48586 + ... + 181636.

It is an arithmetic number, because the mean of its divisors is an integer number (1959722908).

Almost surely, 2^15315633661 is an apocalyptic number.

It is an amenable number.

15315633661 is a deficient number, since it is larger than the sum of its proper divisors (362149603).

15315633661 is a wasteful number, since it uses less digits than its factorization.

15315633661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135771.

The product of its digits is 145800, while the sum is 40.

The spelling of 15315633661 in words is "fifteen billion, three hundred fifteen million, six hundred thirty-three thousand, six hundred sixty-one".