646416461 has 8 divisors (see below), whose sum is σ = 693277920. Its totient is φ = 600838992.

The previous prime is 646416443. The next prime is 646416479. The reversal of 646416461 is 164614646.

It is an interprime number because it is at equal distance from previous prime (646416443) and next prime (646416479).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646416461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646416481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319955 + ... + 321968.

It is an arithmetic number, because the mean of its divisors is an integer number (86659740).

Almost surely, 2^646416461 is an apocalyptic number.

It is an amenable number.

646416461 is a deficient number, since it is larger than the sum of its proper divisors (46861459).

646416461 is a wasteful number, since it uses less digits than its factorization.

646416461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641995.

The product of its digits is 82944, while the sum is 38.

The square root of 646416461 is about 25424.7214537347. The cubic root of 646416461 is about 864.6442726313.

The spelling of 646416461 in words is "six hundred forty-six million, four hundred sixteen thousand, four hundred sixty-one".