646946471 has 16 divisors (see below), whose sum is σ = 693964800. Its totient is φ = 601759200.

The previous prime is 646946459. The next prime is 646946473. The reversal of 646946471 is 174649646.

It is a cyclic number.

It is not a de Polignac number, because 646946471 - 2¹⁰ = 646945447 is a prime.

It is a super-3 number, since 3×646946471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646946473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213356 + ... + 216366.

It is an arithmetic number, because the mean of its divisors is an integer number (43372800).

Almost surely, 2^646946471 is an apocalyptic number.

646946471 is a deficient number, since it is larger than the sum of its proper divisors (47018329).

646946471 is a wasteful number, since it uses less digits than its factorization.

646946471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310.

The product of its digits is 870912, while the sum is 47.

The square root of 646946471 is about 25435.1424411187. The cubic root of 646946471 is about 864.8805212147.

The spelling of 646946471 in words is "six hundred forty-six million, nine hundred forty-six thousand, four hundred seventy-one".