16451373215663 has 4 divisors (see below), whose sum is σ = 16470659703288. Its totient is φ = 16432086728040.

The previous prime is 16451373215653. The next prime is 16451373215731. The reversal of 16451373215663 is 36651237315461.

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

It is a cyclic number.

It is not a de Polignac number, because 16451373215663 - 2¹⁴ = 16451373199279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16451373215653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9643242533 + ... + 9643244238.

It is an arithmetic number, because the mean of its divisors is an integer number (4117664925822).

Almost surely, 2^{16451373215663} is an apocalyptic number.

16451373215663 is a deficient number, since it is larger than the sum of its proper divisors (19286487625).

16451373215663 is an equidigital number, since it uses as much as digits as its factorization.

16451373215663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19286487624.

The product of its digits is 8164800, while the sum is 53.

The spelling of 16451373215663 in words is "sixteen trillion, four hundred fifty-one billion, three hundred seventy-three million, two hundred fifteen thousand, six hundred sixty-three".