15660939550 has 12 divisors (see below), whose sum is σ = 29129347656. Its totient is φ = 6264375800.

The previous prime is 15660939473. The next prime is 15660939559. The reversal of 15660939550 is 5593906651.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15660939494 and 15660939503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15660939559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156609346 + ... + 156609445.

It is an arithmetic number, because the mean of its divisors is an integer number (2427445638).

Almost surely, 2^15660939550 is an apocalyptic number.

15660939550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15660939550 is a deficient number, since it is larger than the sum of its proper divisors (13468408106).

15660939550 is a wasteful number, since it uses less digits than its factorization.

15660939550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313218803 (or 313218798 counting only the distinct ones).

The product of its (nonzero) digits is 1093500, while the sum is 49.

The spelling of 15660939550 in words is "fifteen billion, six hundred sixty million, nine hundred thirty-nine thousand, five hundred fifty".