6461881646 has 32 divisors (see below), whose sum is σ = 11313025920. Its totient is φ = 2737000800.

The previous prime is 6461881597. The next prime is 6461881681.

6461881646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6461881594 and 6461881603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101216 + ... + 152211.

It is an arithmetic number, because the mean of its divisors is an integer number (353532060).

Almost surely, 2^6461881646 is an apocalyptic number.

6461881646 is a deficient number, since it is larger than the sum of its proper divisors (4851144274).

6461881646 is a wasteful number, since it uses less digits than its factorization.

6461881646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253520.

The product of its digits is 1327104, while the sum is 50.

The square root of 6461881646 is about 80385.8298831330. The cubic root of 6461881646 is about 1862.6002908985.

The spelling of 6461881646 in words is "six billion, four hundred sixty-one million, eight hundred eighty-one thousand, six hundred forty-six".