6463972861 has 4 divisors (see below), whose sum is σ = 6464248000. Its totient is φ = 6463697724.

The previous prime is 6463972859. The next prime is 6463972871. The reversal of 6463972861 is 1682793646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6463972861 - 2¹ = 6463972859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6463972799 and 6463972808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6463972871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98661 + ... + 150538.

It is an arithmetic number, because the mean of its divisors is an integer number (1616062000).

Almost surely, 2^6463972861 is an apocalyptic number.

It is an amenable number.

6463972861 is a deficient number, since it is larger than the sum of its proper divisors (275139).

6463972861 is a wasteful number, since it uses less digits than its factorization.

6463972861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275138.

The product of its digits is 2612736, while the sum is 52.

The square root of 6463972861 is about 80398.8361918256. The cubic root of 6463972861 is about 1862.8011961340.

The spelling of 6463972861 in words is "six billion, four hundred sixty-three million, nine hundred seventy-two thousand, eight hundred sixty-one".