15656222146 has 8 divisors (see below), whose sum is σ = 23606014284. Its totient is φ = 7787550720.

The previous prime is 15656222093. The next prime is 15656222147. The reversal of 15656222146 is 64122265651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14390641521 + 1265580625 = 119961^2 + 35575^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 15656222099 and 15656222108.

It is not an unprimeable number, because it can be changed into a prime (15656222147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20279695 + ... + 20280466.

Almost surely, 2^15656222146 is an apocalyptic number.

15656222146 is a deficient number, since it is larger than the sum of its proper divisors (7949792138).

15656222146 is a wasteful number, since it uses less digits than its factorization.

15656222146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40560356.

The product of its digits is 172800, while the sum is 40.

Adding to 15656222146 its reverse (64122265651), we get a palindrome (79778487797).

The spelling of 15656222146 in words is "fifteen billion, six hundred fifty-six million, two hundred twenty-two thousand, one hundred forty-six".