5166421645 has 32 divisors (see below), whose sum is σ = 7754858496. Its totient is φ = 3210062400.

The previous prime is 5166421583. The next prime is 5166421699. The reversal of 5166421645 is 5461246615.

It is not a de Polignac number, because 5166421645 - 2⁷ = 5166421517 is a prime.

It is a super-3 number, since 3×5166421645³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 5166421598 and 5166421607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96340 + ... + 140050.

It is an arithmetic number, because the mean of its divisors is an integer number (242339328).

Almost surely, 2^5166421645 is an apocalyptic number.

5166421645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5166421645 is a deficient number, since it is larger than the sum of its proper divisors (2588436851).

5166421645 is a wasteful number, since it uses less digits than its factorization.

5166421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44041.

The product of its digits is 172800, while the sum is 40.

The square root of 5166421645 is about 71877.8244314615. The cubic root of 5166421645 is about 1728.7410673377.

The spelling of 5166421645 in words is "five billion, one hundred sixty-six million, four hundred twenty-one thousand, six hundred forty-five".