16451372406665 has 8 divisors (see below), whose sum is σ = 22561882157760. Its totient is φ = 11280941078832.

The previous prime is 16451372406653. The next prime is 16451372406731. The reversal of 16451372406665 is 56660427315461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16451372406665 - 2¹⁰ = 16451372405641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16451372406665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235019605775 + ... + 235019605844.

It is an arithmetic number, because the mean of its divisors is an integer number (2820235269720).

Almost surely, 2^{16451372406665} is an apocalyptic number.

It is an amenable number.

16451372406665 is a deficient number, since it is larger than the sum of its proper divisors (6110509751095).

16451372406665 is an equidigital number, since it uses as much as digits as its factorization.

16451372406665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470039211631.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 16451372406665 in words is "sixteen trillion, four hundred fifty-one billion, three hundred seventy-two million, four hundred six thousand, six hundred sixty-five".