16661172206463 has 8 divisors (see below), whose sum is σ = 22225091280000. Its totient is φ = 11102350635288.

The previous prime is 16661172206453. The next prime is 16661172206489. The reversal of 16661172206463 is 36460227116661.

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

It is not a de Polignac number, because 16661172206463 - 2⁸ = 16661172206207 is a prime.

It is a super-3 number, since 3×16661172206463³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661172206453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274367963 + ... + 1274381036.

It is an arithmetic number, because the mean of its divisors is an integer number (2778136410000).

Almost surely, 2^{16661172206463} is an apocalyptic number.

16661172206463 is a deficient number, since it is larger than the sum of its proper divisors (5563919073537).

16661172206463 is a wasteful number, since it uses less digits than its factorization.

16661172206463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548751181.

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 16661172206463 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred six thousand, four hundred sixty-three".