15991600645 has 8 divisors (see below), whose sum is σ = 19851642360. Its totient is φ = 12352132800.

The previous prime is 15991600643. The next prime is 15991600649. The reversal of 15991600645 is 54600619951.

It is a happy number.

15991600645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2420049636 + 13571551009 = 49194^2 + 116497^2 .

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

It is not a de Polignac number, because 15991600645 - 2¹ = 15991600643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15991600595 and 15991600604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15991600643) 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, 55143306 + ... + 55143595.

It is an arithmetic number, because the mean of its divisors is an integer number (2481455295).

Almost surely, 2^15991600645 is an apocalyptic number.

It is an amenable number.

15991600645 is a deficient number, since it is larger than the sum of its proper divisors (3860041715).

15991600645 is a wasteful number, since it uses less digits than its factorization.

15991600645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110286935.

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 15991600645 in words is "fifteen billion, nine hundred ninety-one million, six hundred thousand, six hundred forty-five".