15663213212 has 12 divisors (see below), whose sum is σ = 27411657336. Its totient is φ = 7831311120.

The previous prime is 15663213199. The next prime is 15663213257. The reversal of 15663213212 is 21231236651.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81887 + ... + 195017.

It is an arithmetic number, because the mean of its divisors is an integer number (2284304778).

Almost surely, 2^15663213212 is an apocalyptic number.

It is an amenable number.

15663213212 is a deficient number, since it is larger than the sum of its proper divisors (11748444124).

15663213212 is a wasteful number, since it uses less digits than its factorization.

15663213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147748 (or 147746 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

Adding to 15663213212 its reverse (21231236651), we get a palindrome (36894449863).

The spelling of 15663213212 in words is "fifteen billion, six hundred sixty-three million, two hundred thirteen thousand, two hundred twelve".