6449581761 has 8 divisors (see below), whose sum is σ = 9827934144. Its totient is φ = 3685475280.

The previous prime is 6449581753. The next prime is 6449581807. The reversal of 6449581761 is 1671859446.

6449581761 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6449581761 - 2³ = 6449581753 is a prime.

It is a super-2 number, since 2×6449581761² = 83194209783647722242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6449581741) 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, 153561450 + ... + 153561491.

It is an arithmetic number, because the mean of its divisors is an integer number (1228491768).

Almost surely, 2^6449581761 is an apocalyptic number.

It is an amenable number.

6449581761 is a deficient number, since it is larger than the sum of its proper divisors (3378352383).

6449581761 is a wasteful number, since it uses less digits than its factorization.

6449581761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307122951.

The product of its digits is 1451520, while the sum is 51.

The square root of 6449581761 is about 80309.2881365537. The cubic root of 6449581761 is about 1861.4177498621.

The spelling of 6449581761 in words is "six billion, four hundred forty-nine million, five hundred eighty-one thousand, seven hundred sixty-one".