15680066516 has 12 divisors (see below), whose sum is σ = 27441596532. Its totient is φ = 7839610368.

The previous prime is 15680066513. The next prime is 15680066533. The reversal of 15680066516 is 61566008651.

It can be written as a sum of positive squares in 2 ways, for example, as 8316710416 + 7363356100 = 91196^2 + 85810^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15680066513) 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 3 ways as a sum of consecutive naturals, for example, 13325 + ... + 177588.

It is an arithmetic number, because the mean of its divisors is an integer number (2286799711).

Almost surely, 2^15680066516 is an apocalyptic number.

It is an amenable number.

15680066516 is a deficient number, since it is larger than the sum of its proper divisors (11761530016).

15680066516 is a wasteful number, since it uses less digits than its factorization.

15680066516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211450 (or 211448 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 15680066516 in words is "fifteen billion, six hundred eighty million, sixty-six thousand, five hundred sixteen".