66543816315 has 32 divisors (see below), whose sum is σ = 111117888000. Its totient is φ = 33941293056.

The previous prime is 66543816257. The next prime is 66543816343. The reversal of 66543816315 is 51361834566.

It is not a de Polignac number, because 66543816315 - 2⁹ = 66543815803 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2703936 + ... + 2728434.

It is an arithmetic number, because the mean of its divisors is an integer number (3472434000).

Almost surely, 2^66543816315 is an apocalyptic number.

66543816315 is a deficient number, since it is larger than the sum of its proper divisors (44574071685).

66543816315 is a wasteful number, since it uses less digits than its factorization.

66543816315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32403.

The product of its digits is 1555200, while the sum is 48.

The spelling of 66543816315 in words is "sixty-six billion, five hundred forty-three million, eight hundred sixteen thousand, three hundred fifteen".