15783685680 has 80 divisors (see below), whose sum is σ = 55919349504. Its totient is φ = 3607699200.

The previous prime is 15783685661. The next prime is 15783685691. The reversal of 15783685680 is 8658638751.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 15783685680.

It is an unprimeable number.

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, 4695846 + ... + 4699205.

Almost surely, 2^15783685680 is an apocalyptic number.

15783685680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15783685680 is an abundant number, since it is smaller than the sum of its proper divisors (40135663824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15783685680 is a wasteful number, since it uses less digits than its factorization.

15783685680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395074 (or 9395068 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 15783685680 in words is "fifteen billion, seven hundred eighty-three million, six hundred eighty-five thousand, six hundred eighty".