6440321612 has 12 divisors (see below), whose sum is σ = 11271130920. Its totient is φ = 3219998496.

The previous prime is 6440321557. The next prime is 6440321621. The reversal of 6440321612 is 2161230446.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114839 + ... + 161457.

It is an arithmetic number, because the mean of its divisors is an integer number (939260910).

Almost surely, 2^6440321612 is an apocalyptic number.

It is an amenable number.

6440321612 is a deficient number, since it is larger than the sum of its proper divisors (4830809308).

6440321612 is a wasteful number, since it uses less digits than its factorization.

6440321612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81160 (or 81158 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6440321612 is about 80251.6143887461. The cubic root of 6440321612 is about 1860.5264640687.

The spelling of 6440321612 in words is "six billion, four hundred forty million, three hundred twenty-one thousand, six hundred twelve".