6400646461 has 8 divisors (see below), whose sum is σ = 6983610048. Its totient is φ = 5817864000.

The previous prime is 6400646453. The next prime is 6400646501. The reversal of 6400646461 is 1646460046.

It is a happy number.

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 6400646461 - 2³ = 6400646453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6400646461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400646401) 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, 34776 + ... + 118366.

It is an arithmetic number, because the mean of its divisors is an integer number (872951256).

Almost surely, 2^6400646461 is an apocalyptic number.

It is an amenable number.

6400646461 is a deficient number, since it is larger than the sum of its proper divisors (582963587).

6400646461 is a wasteful number, since it uses less digits than its factorization.

6400646461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90563.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 6400646461 is about 80004.0402792259. The cubic root of 6400646461 is about 1856.6980439688.

The spelling of 6400646461 in words is "six billion, four hundred million, six hundred forty-six thousand, four hundred sixty-one".