16451451671066 has 4 divisors (see below), whose sum is σ = 24677177506602. Its totient is φ = 8225725835532.

The previous prime is 16451451671041. The next prime is 16451451671069. The reversal of 16451451671066 is 66017615415461.

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., 12736083625225 + 3715368045841 = 3568765^2 + 1927529^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16451451670999 and 16451451671017.

It is not an unprimeable number, because it can be changed into a prime (16451451671069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4112862917765 + ... + 4112862917768.

Almost surely, 2^{16451451671066} is an apocalyptic number.

16451451671066 is a deficient number, since it is larger than the sum of its proper divisors (8225725835536).

16451451671066 is an equidigital number, since it uses as much as digits as its factorization.

16451451671066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8225725835535.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 16451451671066 in words is "sixteen trillion, four hundred fifty-one billion, four hundred fifty-one million, six hundred seventy-one thousand, sixty-six".