15661450012 has 48 divisors (see below), whose sum is σ = 29761671744. Its totient is φ = 7168320000.

The previous prime is 15661449989. The next prime is 15661450019. The reversal of 15661450012 is 21005416651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661450019) 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 15 ways as a sum of consecutive naturals, for example, 5974062 + ... + 5976682.

It is an arithmetic number, because the mean of its divisors is an integer number (620034828).

Almost surely, 2^15661450012 is an apocalyptic number.

It is an amenable number.

15661450012 is a deficient number, since it is larger than the sum of its proper divisors (14100221732).

15661450012 is a wasteful number, since it uses less digits than its factorization.

15661450012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550 (or 3548 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 15661450012 its reverse (21005416651), we get a palindrome (36666866663).

The spelling of 15661450012 in words is "fifteen billion, six hundred sixty-one million, four hundred fifty thousand, twelve".