6461888681 has 8 divisors (see below), whose sum is σ = 6681364704. Its totient is φ = 6245358880.

The previous prime is 6461888659. The next prime is 6461888689. The reversal of 6461888681 is 1868881646.

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

It is a de Polignac number, because none of the positive numbers 2^k-6461888681 is a prime.

It is a super-2 number, since 2×6461888681² = 83512010651271839522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6461888689) 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, 732095 + ... + 740868.

It is an arithmetic number, because the mean of its divisors is an integer number (835170588).

Almost surely, 2^6461888681 is an apocalyptic number.

It is an amenable number.

6461888681 is a deficient number, since it is larger than the sum of its proper divisors (219476023).

6461888681 is a wasteful number, since it uses less digits than its factorization.

6461888681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473111.

The product of its digits is 3538944, while the sum is 56.

The square root of 6461888681 is about 80385.8736408332. The cubic root of 6461888681 is about 1862.6009668310.

The spelling of 6461888681 in words is "six billion, four hundred sixty-one million, eight hundred eighty-eight thousand, six hundred eighty-one".