12501016043666 has 4 divisors (see below), whose sum is σ = 18751524065502. Its totient is φ = 6250508021832.

The previous prime is 12501016043591. The next prime is 12501016043671. The reversal of 12501016043666 is 66634061010521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12357833267641 + 143182776025 = 3515371^2 + 378395^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3125254010915 + ... + 3125254010918.

Almost surely, 2^{12501016043666} is an apocalyptic number.

12501016043666 is a deficient number, since it is larger than the sum of its proper divisors (6250508021836).

12501016043666 is an equidigital number, since it uses as much as digits as its factorization.

12501016043666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250508021835.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 12501016043666 in words is "twelve trillion, five hundred one billion, sixteen million, forty-three thousand, six hundred sixty-six".