15646009646 has 16 divisors (see below), whose sum is σ = 24297040800. Its totient is φ = 7547412768.

The previous prime is 15646009609. The next prime is 15646009649. The reversal of 15646009646 is 64690064651.

It is a self number, because there is not a number n which added to its sum of digits gives 15646009646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15646009649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27941 + ... + 179088.

It is an arithmetic number, because the mean of its divisors is an integer number (1518565050).

Almost surely, 2^15646009646 is an apocalyptic number.

15646009646 is a deficient number, since it is larger than the sum of its proper divisors (8651031154).

15646009646 is a wasteful number, since it uses less digits than its factorization.

15646009646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208363.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 15646009646 in words is "fifteen billion, six hundred forty-six million, nine thousand, six hundred forty-six".