16661251163451 has 8 divisors (see below), whose sum is σ = 22215098917440. Its totient is φ = 11107452092552.

The previous prime is 16661251163407. The next prime is 16661251163521. The reversal of 16661251163451 is 15436115216661.

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 16661251163451 - 2⁶ = 16661251163387 is a prime.

It is a super-2 number, since 2×16661251163451² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16661251163451.

It is not an unprimeable number, because it can be changed into a prime (16661251163351) 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, 11364585 + ... + 12746618.

It is an arithmetic number, because the mean of its divisors is an integer number (2776887364680).

Almost surely, 2^{16661251163451} is an apocalyptic number.

16661251163451 is a deficient number, since it is larger than the sum of its proper divisors (5553847753989).

16661251163451 is a wasteful number, since it uses less digits than its factorization.

16661251163451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24341545.

The product of its digits is 777600, while the sum is 48.

The spelling of 16661251163451 in words is "sixteen trillion, six hundred sixty-one billion, two hundred fifty-one million, one hundred sixty-three thousand, four hundred fifty-one".