646689461 has 12 divisors (see below), whose sum is σ = 716438016. Its totient is φ = 583256520.

The previous prime is 646689443. The next prime is 646689467. The reversal of 646689461 is 164986646.

It is not a de Polignac number, because 646689461 - 2¹⁴ = 646673077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646689467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5675 + ... + 36408.

It is an arithmetic number, because the mean of its divisors is an integer number (59703168).

Almost surely, 2^646689461 is an apocalyptic number.

It is an amenable number.

646689461 is a deficient number, since it is larger than the sum of its proper divisors (69748555).

646689461 is a wasteful number, since it uses less digits than its factorization.

646689461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42232 (or 42221 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 646689461 is about 25430.0896773881. The cubic root of 646689461 is about 864.7659767640.

The spelling of 646689461 in words is "six hundred forty-six million, six hundred eighty-nine thousand, four hundred sixty-one".